57205138 has 8 divisors (see below), whose sum is σ = 85943088. Its totient is φ = 28557444.

The previous prime is 57205133. The next prime is 57205147. The reversal of 57205138 is 83150275.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (57205133) 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, 20956 + ... + 23527.

It is an arithmetic number, because the mean of its divisors is an integer number (10742886).

Almost surely, 2^57205138 is an apocalyptic number.

57205138 is a deficient number, since it is larger than the sum of its proper divisors (28737950).

57205138 is a wasteful number, since it uses less digits than its factorization.

57205138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45128.

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 57205138 is about 7563.4078298079. The cubic root of 57205138 is about 385.3112409825.

The spelling of 57205138 in words is "fifty-seven million, two hundred five thousand, one hundred thirty-eight".