64021057 has 2 divisors, whose sum is σ = 64021058. Its totient is φ = 64021056.

The previous prime is 64021043. The next prime is 64021093. The reversal of 64021057 is 75012046.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56535361 + 7485696 = 7519^2 + 2736^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64021057 is a prime.

It is not a weakly prime, because it can be changed into another prime (64021007) 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, 32010528 + 32010529.

It is an arithmetic number, because the mean of its divisors is an integer number (32010529).

Almost surely, 2^64021057 is an apocalyptic number.

It is an amenable number.

64021057 is a deficient number, since it is larger than the sum of its proper divisors (1).

64021057 is an equidigital number, since it uses as much as digits as its factorization.

64021057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 64021057 is about 8001.3159542665. The cubic root of 64021057 is about 400.0438639397.

The spelling of 64021057 in words is "sixty-four million, twenty-one thousand, fifty-seven".