68239904 has 24 divisors (see below), whose sum is σ = 142251228. Its totient is φ = 32112640.

The previous prime is 68239903. The next prime is 68239961. The reversal of 68239904 is 40993286.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 68095504 + 144400 = 8252^2 + 380^2 .

It is not an unprimeable number, because it can be changed into a prime (68239903) 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, 62177 + ... + 63264.

Almost surely, 2^68239904 is an apocalyptic number.

It is an amenable number.

68239904 is an abundant number, since it is smaller than the sum of its proper divisors (74011324).

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

68239904 is a wasteful number, since it uses less digits than its factorization.

68239904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125468 (or 125460 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 68239904 is about 8260.7447606133. The cubic root of 68239904 is about 408.6449494524.

The spelling of 68239904 in words is "sixty-eight million, two hundred thirty-nine thousand, nine hundred four".