68388520 has 16 divisors (see below), whose sum is σ = 153874260. Its totient is φ = 27355392.

The previous prime is 68388473. The next prime is 68388553. The reversal of 68388520 is 2588386.

It can be written as a sum of positive squares in 2 ways, for example, as 55442916 + 12945604 = 7446^2 + 3598^2 .

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 1709713 = 68388520 / (6 + 8 + 3 + 8 + 8 + 5 + 2 + 0).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 854817 + ... + 854896.

Almost surely, 2^68388520 is an apocalyptic number.

It is an amenable number.

68388520 is an abundant number, since it is smaller than the sum of its proper divisors (85485740).

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

68388520 is a wasteful number, since it uses less digits than its factorization.

68388520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1709724 (or 1709720 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 40.

The square root of 68388520 is about 8269.7351831845. The cubic root of 68388520 is about 408.9413896084.

The spelling of 68388520 in words is "sixty-eight million, three hundred eighty-eight thousand, five hundred twenty".