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68656940 = 225113110067
BaseRepresentation
bin1000001011110…
…01111100101100
311210012010121122
410011321330230
5120034010230
610451320112
71462401002
oct405717454
9153163548
1068656940
1135833a80
121abb0038
13112bb411
149192a72
156062be5
hex4179f2c

68656940 has 48 divisors (see below), whose sum is σ = 162376704. Its totient is φ = 24158400.

The previous prime is 68656927. The next prime is 68656957. The reversal of 68656940 is 4965686.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 68656891 and 68656900.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1787 + ... + 11853.

It is an arithmetic number, because the mean of its divisors is an integer number (3382848).

Almost surely, 268656940 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68656940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81188352).

68656940 is an abundant number, since it is smaller than the sum of its proper divisors (93719764).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

68656940 is a wasteful number, since it uses less digits than its factorization.

68656940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10118 (or 10116 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 44.

The square root of 68656940 is about 8285.9483464477. The cubic root of 68656940 is about 409.4757129596.

It can be divided in two parts, 68656 and 940, that added together give a palindrome (69596).

The spelling of 68656940 in words is "sixty-eight million, six hundred fifty-six thousand, nine hundred forty".

Divisors: 1 2 4 5 10 11 20 22 31 44 55 62 110 124 155 220 310 341 620 682 1364 1705 3410 6820 10067 20134 40268 50335 100670 110737 201340 221474 312077 442948 553685 624154 1107370 1248308 1560385 2214740 3120770 3432847 6241540 6865694 13731388 17164235 34328470 68656940