68815880 has 32 divisors (see below), whose sum is σ = 176955840. Its totient is φ = 23593920.

The previous prime is 68815841. The next prime is 68815883. The reversal of 68815880 is 8851886.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (68815883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122606 + ... + 123165.

It is an arithmetic number, because the mean of its divisors is an integer number (5529870).

Almost surely, 2^68815880 is an apocalyptic number.

It is an amenable number.

68815880 is an abundant number, since it is smaller than the sum of its proper divisors (108139960).

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

68815880 is a wasteful number, since it uses less digits than its factorization.

68815880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245789 (or 245785 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 44.

The square root of 68815880 is about 8295.5337381027. The cubic root of 68815880 is about 409.7914465810.

The spelling of 68815880 in words is "sixty-eight million, eight hundred fifteen thousand, eight hundred eighty".