79909656 has 96 divisors (see below), whose sum is σ = 218166480. Its totient is φ = 24371200.

The previous prime is 79909631. The next prime is 79909679. The reversal of 79909656 is 65690997.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a junction number, because it is equal to n+sod(n) for n = 79909599 and 79909608.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 284236 + ... + 284516.

Almost surely, 2^79909656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 79909656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109083240).

79909656 is an abundant number, since it is smaller than the sum of its proper divisors (138256824).

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

79909656 is a wasteful number, since it uses less digits than its factorization.

79909656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365 (or 344 counting only the distinct ones).

The product of its (nonzero) digits is 918540, while the sum is 51.

The square root of 79909656 is about 8939.2201002101. The cubic root of 79909656 is about 430.7246767041.

The spelling of 79909656 in words is "seventy-nine million, nine hundred nine thousand, six hundred fifty-six".