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68843520 = 21134583
BaseRepresentation
bin1000001101001…
…11100000000000
311210112121120000
410012213200000
5120110443040
610455320000
71464105654
oct406474000
9153477500
1068843520
1135951179
121b080000
1311355315
149200a64
15609d130
hex41a7800

68843520 has 240 divisors, whose sum is σ = 249729480. Its totient is φ = 18137088.

The previous prime is 68843507. The next prime is 68843521. The reversal of 68843520 is 2534886.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68843521) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 829399 + ... + 829481.

Almost surely, 268843520 is an apocalyptic number.

68843520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68843520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (124864740).

68843520 is an abundant number, since it is smaller than the sum of its proper divisors (180885960).

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

68843520 is an equidigital number, since it uses as much as digits as its factorization.

68843520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122 (or 93 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The square root of 68843520 is about 8297.1995275514. The cubic root of 68843520 is about 409.8463036841.

It can be divided in two parts, 6884 and 3520, that added together give a square (10404 = 1022).

The spelling of 68843520 in words is "sixty-eight million, eight hundred forty-three thousand, five hundred twenty".