57790721 has 2 divisors, whose sum is σ = 57790722. Its totient is φ = 57790720.

The previous prime is 57790717. The next prime is 57790739. The reversal of 57790721 is 12709775.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33189121 + 24601600 = 5761^2 + 4960^2 .

It is a cyclic number.

It is not a de Polignac number, because 57790721 - 2² = 57790717 is a prime.

It is not a weakly prime, because it can be changed into another prime (57790321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28895360 + 28895361.

It is an arithmetic number, because the mean of its divisors is an integer number (28895361).

Almost surely, 2^57790721 is an apocalyptic number.

It is an amenable number.

57790721 is a deficient number, since it is larger than the sum of its proper divisors (1).

57790721 is an equidigital number, since it uses as much as digits as its factorization.

57790721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30870, while the sum is 38.

The square root of 57790721 is about 7602.0208497478. The cubic root of 57790721 is about 386.6215321707.

The spelling of 57790721 in words is "fifty-seven million, seven hundred ninety thousand, seven hundred twenty-one".