78979776 has 112 divisors (see below), whose sum is σ = 218480640. Its totient is φ = 25159680.

The previous prime is 78979763. The next prime is 78979783. The reversal of 78979776 is 67797987.

Its product of digits (9335088) is a multiple of the sum of its prime divisors (252).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 621825 + ... + 621951.

It is an arithmetic number, because the mean of its divisors is an integer number (1950720).

Almost surely, 2^78979776 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 78979776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109240320).

78979776 is an abundant number, since it is smaller than the sum of its proper divisors (139500864).

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

78979776 is a wasteful number, since it uses less digits than its factorization.

78979776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262 (or 252 counting only the distinct ones).

The product of its digits is 9335088, while the sum is 60.

The square root of 78979776 is about 8887.0566556088. The cubic root of 78979776 is about 429.0474244060.

The spelling of 78979776 in words is "seventy-eight million, nine hundred seventy-nine thousand, seven hundred seventy-six".