68515624 has 16 divisors (see below), whose sum is σ = 128816820. Its totient is φ = 34164480.

The previous prime is 68515621. The next prime is 68515679. The reversal of 68515624 is 42651586.

It can be written as a sum of positive squares in 2 ways, for example, as 67535524 + 980100 = 8218^2 + 990^2 .

It is not an unprimeable number, because it can be changed into a prime (68515621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8497 + ... + 14464.

Almost surely, 2^68515624 is an apocalyptic number.

It is an amenable number.

68515624 is a deficient number, since it is larger than the sum of its proper divisors (60301196).

68515624 is a wasteful number, since it uses less digits than its factorization.

68515624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23340 (or 23336 counting only the distinct ones).

The product of its digits is 57600, while the sum is 37.

The square root of 68515624 is about 8277.4165051663. The cubic root of 68515624 is about 409.1945798523.

The spelling of 68515624 in words is "sixty-eight million, five hundred fifteen thousand, six hundred twenty-four".