764290521 has 6 divisors (see below), whose sum is σ = 1103975210. Its totient is φ = 509527008.

The previous prime is 764290519. The next prime is 764290603. The reversal of 764290521 is 125092467.

764290521 is a `hidden beast` number, since 7 + 6 + 42 + 90 + 521 = 666.

It can be written as a sum of positive squares in only one way, i.e., 732243600 + 32046921 = 27060^2 + 5661^2 .

It is not a de Polignac number, because 764290521 - 2¹ = 764290519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (764290321) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 42460576 + ... + 42460593.

Almost surely, 2^764290521 is an apocalyptic number.

It is an amenable number.

764290521 is a deficient number, since it is larger than the sum of its proper divisors (339684689).

764290521 is a wasteful number, since it uses less digits than its factorization.

764290521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84921175 (or 84921172 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 764290521 is about 27645.8047631101. The cubic root of 764290521 is about 914.2946063856.

The spelling of 764290521 in words is "seven hundred sixty-four million, two hundred ninety thousand, five hundred twenty-one".