764865855 has 64 divisors (see below), whose sum is σ = 1479784320. Its totient is φ = 372584448.

The previous prime is 764865841. The next prime is 764865877. The reversal of 764865855 is 558568467.

It is not a de Polignac number, because 764865855 - 2⁵ = 764865823 is a prime.

It is a super-2 number, since 2×764865855² = 1170039552289762050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 167989 + ... + 172481.

It is an arithmetic number, because the mean of its divisors is an integer number (23121630).

Almost surely, 2^764865855 is an apocalyptic number.

764865855 is a deficient number, since it is larger than the sum of its proper divisors (714918465).

764865855 is a wasteful number, since it uses less digits than its factorization.

764865855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4617 (or 4611 counting only the distinct ones).

The product of its digits is 8064000, while the sum is 54.

The square root of 764865855 is about 27656.2082542058. The cubic root of 764865855 is about 914.5239663048.

The spelling of 764865855 in words is "seven hundred sixty-four million, eight hundred sixty-five thousand, eight hundred fifty-five".