79981297020 has 144 divisors (see below), whose sum is σ = 251741075040. Its totient is φ = 21316006656.

The previous prime is 79981297013. The next prime is 79981297027. The reversal of 79981297020 is 2079218997.

It is an interprime number because it is at equal distance from previous prime (79981297013) and next prime (79981297027).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79981297027) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11023714 + ... + 11030966.

It is an arithmetic number, because the mean of its divisors is an integer number (1748201910).

Almost surely, 2^79981297020 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 79981297020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125870537520).

79981297020 is an abundant number, since it is smaller than the sum of its proper divisors (171759778020).

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

79981297020 is a wasteful number, since it uses less digits than its factorization.

79981297020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9546 (or 9532 counting only the distinct ones).

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

The spelling of 79981297020 in words is "seventy-nine billion, nine hundred eighty-one million, two hundred ninety-seven thousand, twenty".