57642881 has 2 divisors, whose sum is σ = 57642882. Its totient is φ = 57642880.

The previous prime is 57642863. The next prime is 57642911. The reversal of 57642881 is 18824675.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57623281 + 19600 = 7591^2 + 140^2 .

It is a cyclic number.

It is not a de Polignac number, because 57642881 - 2¹⁸ = 57380737 is a prime.

It is a super-2 number, since 2×57642881² = 6645403459960322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (57642581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28821440 + 28821441.

It is an arithmetic number, because the mean of its divisors is an integer number (28821441).

Almost surely, 2^57642881 is an apocalyptic number.

It is an amenable number.

57642881 is a deficient number, since it is larger than the sum of its proper divisors (1).

57642881 is an equidigital number, since it uses as much as digits as its factorization.

57642881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 107520, while the sum is 41.

The square root of 57642881 is about 7592.2908927411. The cubic root of 57642881 is about 386.2915660661.

The spelling of 57642881 in words is "fifty-seven million, six hundred forty-two thousand, eight hundred eighty-one".