68731557 has 16 divisors (see below), whose sum is σ = 95496192. Its totient is φ = 43922160.

The previous prime is 68731547. The next prime is 68731583. The reversal of 68731557 is 75513786.

It is not a de Polignac number, because 68731557 - 2¹⁰ = 68730533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68731517) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6498 + ... + 13404.

It is an arithmetic number, because the mean of its divisors is an integer number (5968512).

Almost surely, 2^68731557 is an apocalyptic number.

It is an amenable number.

68731557 is a deficient number, since it is larger than the sum of its proper divisors (26764635).

68731557 is a wasteful number, since it uses less digits than its factorization.

68731557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7048.

The product of its digits is 176400, while the sum is 42.

The square root of 68731557 is about 8290.4497465457. The cubic root of 68731557 is about 409.6239999219.

The spelling of 68731557 in words is "sixty-eight million, seven hundred thirty-one thousand, five hundred fifty-seven".