766028813 has 4 divisors (see below), whose sum is σ = 835667808. Its totient is φ = 696389820.

The previous prime is 766028807. The next prime is 766028831. The reversal of 766028813 is 318820667.

It is a happy number.

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 766028813 - 2²⁸ = 497593357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (766028803) 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, 34819481 + ... + 34819502.

It is an arithmetic number, because the mean of its divisors is an integer number (208916952).

Almost surely, 2^766028813 is an apocalyptic number.

It is an amenable number.

766028813 is a deficient number, since it is larger than the sum of its proper divisors (69638995).

766028813 is a wasteful number, since it uses less digits than its factorization.

766028813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69638994.

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 766028813 is about 27677.2255293048. The cubic root of 766028813 is about 914.9872346353.

The spelling of 766028813 in words is "seven hundred sixty-six million, twenty-eight thousand, eight hundred thirteen".