68637940 has 24 divisors (see below), whose sum is σ = 164731392. Its totient is φ = 23532960.

The previous prime is 68637931. The next prime is 68637953. The reversal of 68637940 is 4973686.

It is a happy number.

It is a super-2 number, since 2×68637940² = 9422333614887200, which contains 22 as substring.

It is a congruent number.

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, 244996 + ... + 245275.

It is an arithmetic number, because the mean of its divisors is an integer number (6863808).

Almost surely, 2^68637940 is an apocalyptic number.

It is an amenable number.

68637940 is an abundant number, since it is smaller than the sum of its proper divisors (96093452).

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

68637940 is a wasteful number, since it uses less digits than its factorization.

68637940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490287 (or 490285 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 68637940 is about 8284.8017477789. The cubic root of 68637940 is about 409.4379369468.

The spelling of 68637940 in words is "sixty-eight million, six hundred thirty-seven thousand, nine hundred forty".