57720889 has 2 divisors, whose sum is σ = 57720890. Its totient is φ = 57720888.

The previous prime is 57720847. The next prime is 57720953. The reversal of 57720889 is 98802775.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57684025 + 36864 = 7595^2 + 192^2 .

It is a cyclic number.

It is not a de Polignac number, because 57720889 - 2¹⁵ = 57688121 is a prime.

It is not a weakly prime, because it can be changed into another prime (57720809) 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, 28860444 + 28860445.

It is an arithmetic number, because the mean of its divisors is an integer number (28860445).

Almost surely, 2^57720889 is an apocalyptic number.

It is an amenable number.

57720889 is a deficient number, since it is larger than the sum of its proper divisors (1).

57720889 is an equidigital number, since it uses as much as digits as its factorization.

57720889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 282240, while the sum is 46.

The square root of 57720889 is about 7597.4264721681. The cubic root of 57720889 is about 386.4657433962.

The spelling of 57720889 in words is "fifty-seven million, seven hundred twenty thousand, eight hundred eighty-nine".