79776813 has 8 divisors (see below), whose sum is σ = 108632448. Its totient is φ = 52052864.

The previous prime is 79776803. The next prime is 79776859. The reversal of 79776813 is 31867797.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 79776813 - 2²² = 75582509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79776803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 282756 + ... + 283037.

It is an arithmetic number, because the mean of its divisors is an integer number (13579056).

Almost surely, 2^79776813 is an apocalyptic number.

It is an amenable number.

79776813 is a deficient number, since it is larger than the sum of its proper divisors (28855635).

79776813 is a wasteful number, since it uses less digits than its factorization.

79776813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 565843.

The product of its digits is 444528, while the sum is 48.

The square root of 79776813 is about 8931.7866633726. The cubic root of 79776813 is about 430.4858632844.

The spelling of 79776813 in words is "seventy-nine million, seven hundred seventy-six thousand, eight hundred thirteen".