764095021 has 4 divisors (see below), whose sum is σ = 765596700. Its totient is φ = 762593344.

The previous prime is 764095019. The next prime is 764095043. The reversal of 764095021 is 120590467.

764095021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 690375625 + 73719396 = 26275^2 + 8586^2 .

It is a cyclic number.

It is not a de Polignac number, because 764095021 - 2¹ = 764095019 is a prime.

It is a super-2 number, since 2×764095021² = 1167682402233980882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (764090021) 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, 750076 + ... + 751093.

It is an arithmetic number, because the mean of its divisors is an integer number (191399175).

Almost surely, 2^764095021 is an apocalyptic number.

It is an amenable number.

764095021 is a deficient number, since it is larger than the sum of its proper divisors (1501679).

764095021 is a wasteful number, since it uses less digits than its factorization.

764095021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1501678.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 764095021 is about 27642.2687382928. The cubic root of 764095021 is about 914.2166430835.

The spelling of 764095021 in words is "seven hundred sixty-four million, ninety-five thousand, twenty-one".