57213873 has 6 divisors (see below), whose sum is σ = 82642274. Its totient is φ = 38142576.

The previous prime is 57213869. The next prime is 57213907. The reversal of 57213873 is 37831275.

57213873 is a `hidden beast` number, since 572 + 1 + 3 + 87 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 40297104 + 16916769 = 6348^2 + 4113^2 .

It is not a de Polignac number, because 57213873 - 2² = 57213869 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57213833) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3178540 + ... + 3178557.

Almost surely, 2^57213873 is an apocalyptic number.

It is an amenable number.

57213873 is a deficient number, since it is larger than the sum of its proper divisors (25428401).

57213873 is a wasteful number, since it uses less digits than its factorization.

57213873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6357103 (or 6357100 counting only the distinct ones).

The product of its digits is 35280, while the sum is 36.

The square root of 57213873 is about 7563.9852591078. The cubic root of 57213873 is about 385.3308518223.

The spelling of 57213873 in words is "fifty-seven million, two hundred thirteen thousand, eight hundred seventy-three".