57139378 has 4 divisors (see below), whose sum is σ = 85709070. Its totient is φ = 28569688.

The previous prime is 57139373. The next prime is 57139421. The reversal of 57139378 is 87393175.

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

It can be written as a sum of positive squares in only one way, i.e., 34070569 + 23068809 = 5837^2 + 4803^2 .

It is not an unprimeable number, because it can be changed into a prime (57139373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14284843 + ... + 14284846.

Almost surely, 2^57139378 is an apocalyptic number.

57139378 is a deficient number, since it is larger than the sum of its proper divisors (28569692).

57139378 is a wasteful number, since it uses less digits than its factorization.

57139378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28569691.

The product of its digits is 158760, while the sum is 43.

The square root of 57139378 is about 7559.0593330123. The cubic root of 57139378 is about 385.1635398995.

The spelling of 57139378 in words is "fifty-seven million, one hundred thirty-nine thousand, three hundred seventy-eight".