76981813 has 4 divisors (see below), whose sum is σ = 77033248. Its totient is φ = 76930380.

The previous prime is 76981799. The next prime is 76981841. The reversal of 76981813 is 31818967.

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 76981813 - 2¹³ = 76973621 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 76981813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76981013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23403 + ... + 26488.

It is an arithmetic number, because the mean of its divisors is an integer number (19258312).

Almost surely, 2^76981813 is an apocalyptic number.

It is an amenable number.

76981813 is a deficient number, since it is larger than the sum of its proper divisors (51435).

76981813 is a wasteful number, since it uses less digits than its factorization.

76981813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51434.

The product of its digits is 72576, while the sum is 43.

The square root of 76981813 is about 8773.9280256907. The cubic root of 76981813 is about 425.3985889244.

The spelling of 76981813 in words is "seventy-six million, nine hundred eighty-one thousand, eight hundred thirteen".