764677621 has 2 divisors, whose sum is σ = 764677622. Its totient is φ = 764677620.

The previous prime is 764677607. The next prime is 764677649. The reversal of 764677621 is 126776467.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 498628900 + 266048721 = 22330^2 + 16311^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-764677621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (764677681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 382338810 + 382338811.

It is an arithmetic number, because the mean of its divisors is an integer number (382338811).

Almost surely, 2^764677621 is an apocalyptic number.

It is an amenable number.

764677621 is a deficient number, since it is larger than the sum of its proper divisors (1).

764677621 is an equidigital number, since it uses as much as digits as its factorization.

764677621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 592704, while the sum is 46.

The square root of 764677621 is about 27652.8049391016. The cubic root of 764677621 is about 914.4489384958.

The spelling of 764677621 in words is "seven hundred sixty-four million, six hundred seventy-seven thousand, six hundred twenty-one".