57820639 has 2 divisors, whose sum is σ = 57820640. Its totient is φ = 57820638.

The previous prime is 57820589. The next prime is 57820657. The reversal of 57820639 is 93602875.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 57820639 - 2²¹ = 55723487 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57820699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28910319 + 28910320.

It is an arithmetic number, because the mean of its divisors is an integer number (28910320).

Almost surely, 2^57820639 is an apocalyptic number.

57820639 is a deficient number, since it is larger than the sum of its proper divisors (1).

57820639 is an equidigital number, since it uses as much as digits as its factorization.

57820639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 57820639 is about 7603.9883613798. The cubic root of 57820639 is about 386.6882380785.

The spelling of 57820639 in words is "fifty-seven million, eight hundred twenty thousand, six hundred thirty-nine".