57156738 has 32 divisors (see below), whose sum is σ = 118800000. Its totient is φ = 18310656.

The previous prime is 57156727. The next prime is 57156739. The reversal of 57156738 is 83765175.

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 57156738.

It is not an unprimeable number, because it can be changed into a prime (57156739) 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, 45138 + ... + 46386.

It is an arithmetic number, because the mean of its divisors is an integer number (3712500).

Almost surely, 2^57156738 is an apocalyptic number.

57156738 is a gapful number since it is divisible by the number (58) formed by its first and last digit.

57156738 is an abundant number, since it is smaller than the sum of its proper divisors (61643262).

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

57156738 is a wasteful number, since it uses less digits than its factorization.

57156738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1546.

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

The square root of 57156738 is about 7560.2075368339. The cubic root of 57156738 is about 385.2025425526.

The spelling of 57156738 in words is "fifty-seven million, one hundred fifty-six thousand, seven hundred thirty-eight".