57138566 has 4 divisors (see below), whose sum is σ = 85707852. Its totient is φ = 28569282.

The previous prime is 57138539. The next prime is 57138569. The reversal of 57138566 is 66583175.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57138569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14284640 + ... + 14284643.

It is an arithmetic number, because the mean of its divisors is an integer number (21426963).

Almost surely, 2^57138566 is an apocalyptic number.

57138566 is a deficient number, since it is larger than the sum of its proper divisors (28569286).

57138566 is a wasteful number, since it uses less digits than its factorization.

57138566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28569285.

The product of its digits is 151200, while the sum is 41.

The square root of 57138566 is about 7559.0056224347. The cubic root of 57138566 is about 385.1617153885.

The spelling of 57138566 in words is "fifty-seven million, one hundred thirty-eight thousand, five hundred sixty-six".