79724855 has 32 divisors (see below), whose sum is σ = 116328960. Its totient is φ = 51235200.

The previous prime is 79724851. The next prime is 79724861. The reversal of 79724855 is 55842797.

It is a happy number.

It is not a de Polignac number, because 79724855 - 2² = 79724851 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79724851) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 66572 + ... + 67758.

It is an arithmetic number, because the mean of its divisors is an integer number (3635280).

Almost surely, 2^79724855 is an apocalyptic number.

79724855 is a deficient number, since it is larger than the sum of its proper divisors (36604105).

79724855 is a wasteful number, since it uses less digits than its factorization.

79724855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1319.

The product of its digits is 705600, while the sum is 47.

The square root of 79724855 is about 8928.8775890366. The cubic root of 79724855 is about 430.3923856549.

It can be divided in two parts, 797 and 24855, that added together give a palindrome (25652).

The spelling of 79724855 in words is "seventy-nine million, seven hundred twenty-four thousand, eight hundred fifty-five".