76812689 has 4 divisors (see below), whose sum is σ = 76854756. Its totient is φ = 76770624.

The previous prime is 76812683. The next prime is 76812691. The reversal of 76812689 is 98621867.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 55726225 + 21086464 = 7465^2 + 4592^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-76812689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76812683) 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, 18164 + ... + 21989.

It is an arithmetic number, because the mean of its divisors is an integer number (19213689).

Almost surely, 2^76812689 is an apocalyptic number.

It is an amenable number.

76812689 is a deficient number, since it is larger than the sum of its proper divisors (42067).

76812689 is a wasteful number, since it uses less digits than its factorization.

76812689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42066.

The product of its digits is 290304, while the sum is 47.

The square root of 76812689 is about 8764.2848538828. The cubic root of 76812689 is about 425.0868362356.

The spelling of 76812689 in words is "seventy-six million, eight hundred twelve thousand, six hundred eighty-nine".