79778113 has 4 divisors (see below), whose sum is σ = 80484228. Its totient is φ = 79072000.

The previous prime is 79778107. The next prime is 79778143. The reversal of 79778113 is 31187797.

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 20903184 + 58874929 = 4572^2 + 7673^2 .

It is a cyclic number.

It is not a de Polignac number, because 79778113 - 2¹⁷ = 79647041 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 79778113.

It is not an unprimeable number, because it can be changed into a prime (79778143) 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, 352888 + ... + 353113.

It is an arithmetic number, because the mean of its divisors is an integer number (20121057).

Almost surely, 2^79778113 is an apocalyptic number.

It is an amenable number.

79778113 is a deficient number, since it is larger than the sum of its proper divisors (706115).

79778113 is a wasteful number, since it uses less digits than its factorization.

79778113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706114.

The product of its digits is 74088, while the sum is 43.

The square root of 79778113 is about 8931.8594368698. The cubic root of 79778113 is about 430.4882015937.

It can be divided in two parts, 797 and 78113, that multiplied together give a triangular number (62256061 = T₁₁₁₅₈).

The spelling of 79778113 in words is "seventy-nine million, seven hundred seventy-eight thousand, one hundred thirteen".