79685886 has 64 divisors (see below), whose sum is σ = 194987520. Its totient is φ = 21202560.

The previous prime is 79685873. The next prime is 79685891. The reversal of 79685886 is 68858697.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 47860 + ... + 49496.

It is an arithmetic number, because the mean of its divisors is an integer number (3046680).

Almost surely, 2^79685886 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 79685886, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97493760).

79685886 is an abundant number, since it is smaller than the sum of its proper divisors (115301634).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

79685886 is a wasteful number, since it uses less digits than its factorization.

79685886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1729.

The product of its digits is 5806080, while the sum is 57.

The square root of 79685886 is about 8926.6951331386. The cubic root of 79685886 is about 430.3222498765.

The spelling of 79685886 in words is "seventy-nine million, six hundred eighty-five thousand, eight hundred eighty-six".