764564621 has 4 divisors (see below), whose sum is σ = 765343392. Its totient is φ = 763785852.

The previous prime is 764564611. The next prime is 764564663. The reversal of 764564621 is 126465467.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 764564621 - 2¹⁴ = 764548237 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 (764564611) 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, 387911 + ... + 389876.

It is an arithmetic number, because the mean of its divisors is an integer number (191335848).

Almost surely, 2^764564621 is an apocalyptic number.

It is an amenable number.

764564621 is a deficient number, since it is larger than the sum of its proper divisors (778771).

764564621 is an equidigital number, since it uses as much as digits as its factorization.

764564621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 778770.

The product of its digits is 241920, while the sum is 41.

The square root of 764564621 is about 27650.7616712452. The cubic root of 764564621 is about 914.4038921401.

The spelling of 764564621 in words is "seven hundred sixty-four million, five hundred sixty-four thousand, six hundred twenty-one".