64927813 has 2 divisors, whose sum is σ = 64927814. Its totient is φ = 64927812.

The previous prime is 64927799. The next prime is 64927817. The reversal of 64927813 is 31872946.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62758084 + 2169729 = 7922^2 + 1473^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64927813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64927817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32463906 + 32463907.

It is an arithmetic number, because the mean of its divisors is an integer number (32463907).

Almost surely, 2^64927813 is an apocalyptic number.

It is an amenable number.

64927813 is a deficient number, since it is larger than the sum of its proper divisors (1).

64927813 is an equidigital number, since it uses as much as digits as its factorization.

64927813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 40.

The square root of 64927813 is about 8057.7796569527. The cubic root of 64927813 is about 401.9236775809.

The spelling of 64927813 in words is "sixty-four million, nine hundred twenty-seven thousand, eight hundred thirteen".