57864509 has 2 divisors, whose sum is σ = 57864510. Its totient is φ = 57864508.

The previous prime is 57864493. The next prime is 57864517. The reversal of 57864509 is 90546875.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31956409 + 25908100 = 5653^2 + 5090^2 .

It is a cyclic number.

It is not a de Polignac number, because 57864509 - 2⁴ = 57864493 is a prime.

It is a super-2 number, since 2×57864509² = 6696602803622162, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 57864509.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57864589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28932254 + 28932255.

It is an arithmetic number, because the mean of its divisors is an integer number (28932255).

Almost surely, 2^57864509 is an apocalyptic number.

It is an amenable number.

57864509 is a deficient number, since it is larger than the sum of its proper divisors (1).

57864509 is an equidigital number, since it uses as much as digits as its factorization.

57864509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 302400, while the sum is 44.

The square root of 57864509 is about 7606.8724847995. The cubic root of 57864509 is about 386.7860101126.

The spelling of 57864509 in words is "fifty-seven million, eight hundred sixty-four thousand, five hundred nine".