68750640 has 160 divisors (see below), whose sum is σ = 270696960. Its totient is φ = 15710976.

The previous prime is 68750621. The next prime is 68750659. The reversal of 68750640 is 4605786.

It is a happy number.

68750640 is a `hidden beast` number, since 6 + 8 + 7 + 5 + 0 + 640 = 666.

It is an interprime number because it is at equal distance from previous prime (68750621) and next prime (68750659).

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

It is a junction number, because it is equal to n+sod(n) for n = 68750595 and 68750604.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12847 + ... + 17393.

It is an arithmetic number, because the mean of its divisors is an integer number (1691856).

Almost surely, 2^68750640 is an apocalyptic number.

68750640 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 68750640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (135348480).

68750640 is an abundant number, since it is smaller than the sum of its proper divisors (201946320).

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

68750640 is a wasteful number, since it uses less digits than its factorization.

68750640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4576 (or 4564 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 68750640 is about 8291.6005692508. The cubic root of 68750640 is about 409.6619064857.

The spelling of 68750640 in words is "sixty-eight million, seven hundred fifty thousand, six hundred forty".