79984889856 has 195 divisors, whose sum is σ = 239425657603. Its totient is φ = 26607329280.

The previous prime is 79984889843. The next prime is 79984889863. The reversal of 79984889856 is 65898848997.

The square root of 79984889856 is 282816.

It is a perfect power (a square), and thus also a powerful number.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 162901771 + ... + 162902261.

Almost surely, 2^79984889856 is an apocalyptic number.

79984889856 is the 282816-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 79984889856

79984889856 is an abundant number, since it is smaller than the sum of its proper divisors (159440767747).

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

79984889856 is an frugal number, since it uses more digits than its factorization.

79984889856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1018 (or 496 counting only the distinct ones).

The product of its digits is 2508226560, while the sum is 81.

Multiplying 79984889856 by its sum of digits (81), we get a square (6478776078336 = 2545344²).

79984889856 divided by its sum of digits (81) gives a square (987467776 = 31424²).

The spelling of 79984889856 in words is "seventy-nine billion, nine hundred eighty-four million, eight hundred eighty-nine thousand, eight hundred fifty-six".