79009840 has 80 divisors (see below), whose sum is σ = 226110528. Its totient is φ = 25003008.

The previous prime is 79009811. The next prime is 79009859. The reversal of 79009840 is 4890097.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 79009840.

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 15 ways as a sum of consecutive naturals, for example, 1854 + ... + 12706.

Almost surely, 2^79009840 is an apocalyptic number.

79009840 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 79009840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113055264).

79009840 is an abundant number, since it is smaller than the sum of its proper divisors (147100688).

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

79009840 is a wasteful number, since it uses less digits than its factorization.

79009840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10886 (or 10880 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 79009840 is about 8888.7479433270. The cubic root of 79009840 is about 429.1018570979.

The spelling of 79009840 in words is "seventy-nine million, nine thousand, eight hundred forty".