64570813 has 2 divisors, whose sum is σ = 64570814. Its totient is φ = 64570812.

The previous prime is 64570783. The next prime is 64570819. The reversal of 64570813 is 31807546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51451929 + 13118884 = 7173^2 + 3622^2 .

It is a cyclic number.

It is not a de Polignac number, because 64570813 - 2¹³ = 64562621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64570819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32285406 + 32285407.

It is an arithmetic number, because the mean of its divisors is an integer number (32285407).

Almost surely, 2^64570813 is an apocalyptic number.

It is an amenable number.

64570813 is a deficient number, since it is larger than the sum of its proper divisors (1).

64570813 is an equidigital number, since it uses as much as digits as its factorization.

64570813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 64570813 is about 8035.5966175512. The cubic root of 64570813 is about 401.1856757102.

The spelling of 64570813 in words is "sixty-four million, five hundred seventy thousand, eight hundred thirteen".