68690457 has 32 divisors (see below), whose sum is σ = 113742720. Its totient is φ = 40608000.

The previous prime is 68690449. The next prime is 68690471. The reversal of 68690457 is 75409686.

It is not a de Polignac number, because 68690457 - 2³ = 68690449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68690057) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9357 + ... + 14997.

It is an arithmetic number, because the mean of its divisors is an integer number (3554460).

Almost surely, 2^68690457 is an apocalyptic number.

It is an amenable number.

68690457 is a deficient number, since it is larger than the sum of its proper divisors (45052263).

68690457 is a wasteful number, since it uses less digits than its factorization.

68690457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5702 (or 5696 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The square root of 68690457 is about 8287.9706201217. The cubic root of 68690457 is about 409.5423348469.

The spelling of 68690457 in words is "sixty-eight million, six hundred ninety thousand, four hundred fifty-seven".