79984440 has 96 divisors (see below), whose sum is σ = 266338800. Its totient is φ = 20805120.

The previous prime is 79984423. The next prime is 79984447. The reversal of 79984440 is 4448997.

It is a super-2 number, since 2×79984440² = 12795021284227200, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79984447) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 12051 + ... + 17469.

Almost surely, 2^79984440 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 79984440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (133169400).

79984440 is an abundant number, since it is smaller than the sum of its proper divisors (186354360).

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

79984440 is a wasteful number, since it uses less digits than its factorization.

79984440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5477 (or 5470 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 79984440 is about 8943.4020372563. The cubic root of 79984440 is about 430.8590003585.

The spelling of 79984440 in words is "seventy-nine million, nine hundred eighty-four thousand, four hundred forty".