764225257 has 2 divisors, whose sum is σ = 764225258. Its totient is φ = 764225256.

The previous prime is 764225243. The next prime is 764225309. The reversal of 764225257 is 752522467.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 674752576 + 89472681 = 25976^2 + 9459^2 .

It is a cyclic number.

It is not a de Polignac number, because 764225257 - 2⁷ = 764225129 is a prime.

It is not a weakly prime, because it can be changed into another prime (764225207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 382112628 + 382112629.

It is an arithmetic number, because the mean of its divisors is an integer number (382112629).

Almost surely, 2^764225257 is an apocalyptic number.

It is an amenable number.

764225257 is a deficient number, since it is larger than the sum of its proper divisors (1).

764225257 is an equidigital number, since it uses as much as digits as its factorization.

764225257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 235200, while the sum is 40.

The square root of 764225257 is about 27644.6243779871. The cubic root of 764225257 is about 914.2685812812.

The spelling of 764225257 in words is "seven hundred sixty-four million, two hundred twenty-five thousand, two hundred fifty-seven".