764066621 has 4 divisors (see below), whose sum is σ = 764756700. Its totient is φ = 763376544.

The previous prime is 764066599. The next prime is 764066629. The reversal of 764066621 is 126660467.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 79459396 + 684607225 = 8914^2 + 26165^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-764066621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (764066629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 343376 + ... + 345593.

It is an arithmetic number, because the mean of its divisors is an integer number (191189175).

Almost surely, 2^764066621 is an apocalyptic number.

It is an amenable number.

764066621 is a deficient number, since it is larger than the sum of its proper divisors (690079).

764066621 is a wasteful number, since it uses less digits than its factorization.

764066621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690078.

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 764066621 is about 27641.7550274942. The cubic root of 764066621 is about 914.2053163621.

The spelling of 764066621 in words is "seven hundred sixty-four million, sixty-six thousand, six hundred twenty-one".