765221916 has 24 divisors (see below), whose sum is σ = 1809979024. Its totient is φ = 251579520.

The previous prime is 765221893. The next prime is 765221921. The reversal of 765221916 is 619122567.

765221916 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×765221916² = 1171129161453422112, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 435895 + ... + 437646.

Almost surely, 2^765221916 is an apocalyptic number.

It is an amenable number.

765221916 is an abundant number, since it is smaller than the sum of its proper divisors (1044757108).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

765221916 is a wasteful number, since it uses less digits than its factorization.

765221916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 873621 (or 873619 counting only the distinct ones).

The product of its digits is 45360, while the sum is 39.

The square root of 765221916 is about 27662.6447759429. The cubic root of 765221916 is about 914.6658542800.

The spelling of 765221916 in words is "seven hundred sixty-five million, two hundred twenty-one thousand, nine hundred sixteen".