57732721 has 2 divisors, whose sum is σ = 57732722. Its totient is φ = 57732720.

The previous prime is 57732673. The next prime is 57732743. The reversal of 57732721 is 12723775.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57153600 + 579121 = 7560^2 + 761^2 .

It is a cyclic number.

It is not a de Polignac number, because 57732721 - 2⁹ = 57732209 is a prime.

It is not a weakly prime, because it can be changed into another prime (57732791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28866360 + 28866361.

It is an arithmetic number, because the mean of its divisors is an integer number (28866361).

Almost surely, 2^57732721 is an apocalyptic number.

It is an amenable number.

57732721 is a deficient number, since it is larger than the sum of its proper divisors (1).

57732721 is an equidigital number, since it uses as much as digits as its factorization.

57732721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20580, while the sum is 34.

The square root of 57732721 is about 7598.2051169997. The cubic root of 57732721 is about 386.4921483387.

The spelling of 57732721 in words is "fifty-seven million, seven hundred thirty-two thousand, seven hundred twenty-one".