79778305 has 4 divisors (see below), whose sum is σ = 95733972. Its totient is φ = 63822640.

The previous prime is 79778291. The next prime is 79778323. The reversal of 79778305 is 50387797.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50387797 = 2213 ⋅22769.

It can be written as a sum of positive squares in 2 ways, for example, as 8071281 + 71707024 = 2841^2 + 8468^2 .

It is not a de Polignac number, because 79778305 - 2⁷ = 79778177 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7977826 + ... + 7977835.

It is an arithmetic number, because the mean of its divisors is an integer number (23933493).

Almost surely, 2^79778305 is an apocalyptic number.

It is an amenable number.

79778305 is a deficient number, since it is larger than the sum of its proper divisors (15955667).

79778305 is a wasteful number, since it uses less digits than its factorization.

79778305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15955666.

The product of its (nonzero) digits is 370440, while the sum is 46.

The square root of 79778305 is about 8931.8701849053. The cubic root of 79778305 is about 430.4885469418.

The spelling of 79778305 in words is "seventy-nine million, seven hundred seventy-eight thousand, three hundred five".