764364721 has 2 divisors, whose sum is σ = 764364722. Its totient is φ = 764364720.

The previous prime is 764364701. The next prime is 764364767. The reversal of 764364721 is 127463467.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 763748496 + 616225 = 27636^2 + 785^2 .

It is a cyclic number.

It is not a de Polignac number, because 764364721 - 2⁷ = 764364593 is a prime.

It is not a weakly prime, because it can be changed into another prime (764364701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 382182360 + 382182361.

It is an arithmetic number, because the mean of its divisors is an integer number (382182361).

Almost surely, 2^764364721 is an apocalyptic number.

It is an amenable number.

764364721 is a deficient number, since it is larger than the sum of its proper divisors (1).

764364721 is an equidigital number, since it uses as much as digits as its factorization.

764364721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 169344, while the sum is 40.

The square root of 764364721 is about 27647.1467063059. The cubic root of 764364721 is about 914.3241930688.

The spelling of 764364721 in words is "seven hundred sixty-four million, three hundred sixty-four thousand, seven hundred twenty-one".