79981650 has 72 divisors (see below), whose sum is σ = 245591424. Its totient is φ = 18280800.

The previous prime is 79981637. The next prime is 79981667. The reversal of 79981650 is 5618997.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 79981596 and 79981605.

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 35 ways as a sum of consecutive naturals, for example, 9546 + ... + 15845.

It is an arithmetic number, because the mean of its divisors is an integer number (3410992).

Almost surely, 2^79981650 is an apocalyptic number.

79981650 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

79981650 is an abundant number, since it is smaller than the sum of its proper divisors (165609774).

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

79981650 is a wasteful number, since it uses less digits than its factorization.

79981650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25416 (or 25408 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 45.

The square root of 79981650 is about 8943.2460549847. The cubic root of 79981650 is about 430.8539905900.

The spelling of 79981650 in words is "seventy-nine million, nine hundred eighty-one thousand, six hundred fifty".