57666731 has 4 divisors (see below), whose sum is σ = 57692832. Its totient is φ = 57640632.

The previous prime is 57666709. The next prime is 57666733. The reversal of 57666731 is 13766675.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 57666731 - 2⁶ = 57666667 is a prime.

It is a super-2 number, since 2×57666731² = 6650903728452722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57666733) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9395 + ... + 14268.

It is an arithmetic number, because the mean of its divisors is an integer number (14423208).

Almost surely, 2^57666731 is an apocalyptic number.

57666731 is a deficient number, since it is larger than the sum of its proper divisors (26101).

57666731 is a wasteful number, since it uses less digits than its factorization.

57666731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26100.

The product of its digits is 158760, while the sum is 41.

The square root of 57666731 is about 7593.8614024750. The cubic root of 57666731 is about 386.3448353414.

The spelling of 57666731 in words is "fifty-seven million, six hundred sixty-six thousand, seven hundred thirty-one".