764039989 has 4 divisors (see below), whose sum is σ = 804252640. Its totient is φ = 723827340.

The previous prime is 764039963. The next prime is 764040023. The reversal of 764039989 is 989930467.

764039989 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, 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 764039989 - 2¹¹ = 764037941 is a prime.

It is a super-2 number, since 2×764039989² = 1167514209582240242, 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 (764039929) 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, 20106297 + ... + 20106334.

It is an arithmetic number, because the mean of its divisors is an integer number (201063160).

Almost surely, 2^764039989 is an apocalyptic number.

It is an amenable number.

764039989 is a deficient number, since it is larger than the sum of its proper divisors (40212651).

764039989 is a wasteful number, since it uses less digits than its factorization.

764039989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40212650.

The product of its (nonzero) digits is 2939328, while the sum is 55.

The square root of 764039989 is about 27641.2732883274. The cubic root of 764039989 is about 914.1946945139.

The spelling of 764039989 in words is "seven hundred sixty-four million, thirty-nine thousand, nine hundred eighty-nine".