68931820 has 24 divisors (see below), whose sum is σ = 144916128. Its totient is φ = 27542400.

The previous prime is 68931803. The next prime is 68931833. The reversal of 68931820 is 2813986.

It is a self number, because there is not a number n which added to its sum of digits gives 68931820.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29080 + ... + 31360.

It is an arithmetic number, because the mean of its divisors is an integer number (6038172).

Almost surely, 2^68931820 is an apocalyptic number.

It is an amenable number.

68931820 is an abundant number, since it is smaller than the sum of its proper divisors (75984308).

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

68931820 is a wasteful number, since it uses less digits than its factorization.

68931820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3801 (or 3799 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 68931820 is about 8302.5188948897. The cubic root of 68931820 is about 410.0214543602.

It can be divided in two parts, 68931 and 820, that added together give a triangular number (69751 = T₃₇₃).

The spelling of 68931820 in words is "sixty-eight million, nine hundred thirty-one thousand, eight hundred twenty".