57328891 has 2 divisors, whose sum is σ = 57328892. Its totient is φ = 57328890.

The previous prime is 57328849. The next prime is 57328907. The reversal of 57328891 is 19882375.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 57328891 - 2⁷ = 57328763 is a prime.

It is not a weakly prime, because it can be changed into another prime (57328991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28664445 + 28664446.

It is an arithmetic number, because the mean of its divisors is an integer number (28664446).

Almost surely, 2^57328891 is an apocalyptic number.

57328891 is a deficient number, since it is larger than the sum of its proper divisors (1).

57328891 is an equidigital number, since it uses as much as digits as its factorization.

57328891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 43.

The square root of 57328891 is about 7571.5844444872. The cubic root of 57328891 is about 385.5888913248.

The spelling of 57328891 in words is "fifty-seven million, three hundred twenty-eight thousand, eight hundred ninety-one".