57138989 has 8 divisors (see below), whose sum is σ = 62135928. Its totient is φ = 52323840.

The previous prime is 57138973. The next prime is 57139003. The reversal of 57138989 is 98983175.

It can be written as a sum of positive squares in 4 ways, for example, as 43692100 + 13446889 = 6610^2 + 3667^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 57138989 - 2⁴ = 57138973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57138919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44792 + ... + 46049.

It is an arithmetic number, because the mean of its divisors is an integer number (7766991).

Almost surely, 2^57138989 is an apocalyptic number.

It is an amenable number.

57138989 is a deficient number, since it is larger than the sum of its proper divisors (4996939).

57138989 is a wasteful number, since it uses less digits than its factorization.

57138989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90895.

The product of its digits is 544320, while the sum is 50.

The square root of 57138989 is about 7559.0336022537. The cubic root of 57138989 is about 385.1626658440.

The spelling of 57138989 in words is "fifty-seven million, one hundred thirty-eight thousand, nine hundred eighty-nine".