765218164 has 12 divisors (see below), whose sum is σ = 1375324804. Its totient is φ = 372268224.

The previous prime is 765218143. The next prime is 765218171. The reversal of 765218164 is 461812567.

It can be written as a sum of positive squares in 2 ways, for example, as 723072100 + 42146064 = 26890^2 + 6492^2 .

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2585049 + ... + 2585344.

Almost surely, 2^765218164 is an apocalyptic number.

765218164 is a gapful number since it is divisible by the number (74) formed by its first and last digit.

It is an amenable number.

765218164 is a deficient number, since it is larger than the sum of its proper divisors (610106640).

765218164 is a wasteful number, since it uses less digits than its factorization.

765218164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5170434 (or 5170432 counting only the distinct ones).

The product of its digits is 80640, while the sum is 40.

The square root of 765218164 is about 27662.5769587723. The cubic root of 765218164 is about 914.6643593621.

The spelling of 765218164 in words is "seven hundred sixty-five million, two hundred eighteen thousand, one hundred sixty-four".