79919784 has 144 divisors (see below), whose sum is σ = 261424800. Its totient is φ = 22807008.

The previous prime is 79919773. The next prime is 79919809. The reversal of 79919784 is 48791997.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is a nialpdrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 79919784.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 94837 + ... + 95675.

It is an arithmetic number, because the mean of its divisors is an integer number (1815450).

Almost surely, 2^79919784 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 79919784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (130712400).

79919784 is an abundant number, since it is smaller than the sum of its proper divisors (181505016).

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

79919784 is a wasteful number, since it uses less digits than its factorization.

79919784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 874 (or 851 counting only the distinct ones).

The product of its digits is 1143072, while the sum is 54.

The square root of 79919784 is about 8939.7865746336. The cubic root of 79919784 is about 430.7428730668.

The spelling of 79919784 in words is "seventy-nine million, nine hundred nineteen thousand, seven hundred eighty-four".