79778101 has 12 divisors (see below), whose sum is σ = 88991812. Its totient is φ = 71092224.

The previous prime is 79778063. The next prime is 79778107. The reversal of 79778101 is 10187797.

It can be written as a sum of positive squares in 6 ways, for example, as 4972900 + 74805201 = 2230^2 + 8649^2 .

It is not a de Polignac number, because 79778101 - 2²⁵ = 46223669 is a prime.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79778107) 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 11 ways as a sum of consecutive naturals, for example, 7285 + ... + 14581.

Almost surely, 2^79778101 is an apocalyptic number.

It is an amenable number.

79778101 is a deficient number, since it is larger than the sum of its proper divisors (9213711).

79778101 is a wasteful number, since it uses less digits than its factorization.

79778101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7368 (or 7339 counting only the distinct ones).

The product of its (nonzero) digits is 24696, while the sum is 40.

The square root of 79778101 is about 8931.8587651171. The cubic root of 79778101 is about 430.4881800094.

The spelling of 79778101 in words is "seventy-nine million, seven hundred seventy-eight thousand, one hundred one".