57138806 has 12 divisors (see below), whose sum is σ = 87120852. Its totient is φ = 28099896.

The previous prime is 57138803. The next prime is 57138811. The reversal of 57138806 is 60883175.

It is a super-2 number, since 2×57138806² = 6529686302211272, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 57138806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57138803) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 87176 + ... + 87828.

It is an arithmetic number, because the mean of its divisors is an integer number (7260071).

Almost surely, 2^57138806 is an apocalyptic number.

57138806 is a deficient number, since it is larger than the sum of its proper divisors (29982046).

57138806 is an frugal number, since it uses more digits than its factorization.

57138806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1375 (or 722 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 57138806 is about 7559.0214975220. The cubic root of 57138806 is about 385.1622546546.

The spelling of 57138806 in words is "fifty-seven million, one hundred thirty-eight thousand, eight hundred six".