79044840 has 144 divisors (see below), whose sum is σ = 298904580. Its totient is φ = 18063360.

The previous prime is 79044821. The next prime is 79044841. The reversal of 79044840 is 4844097.

It can be written as a sum of positive squares in 2 ways, for example, as 78535044 + 509796 = 8862^2 + 714^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 79044795 and 79044804.

It is not an unprimeable number, because it can be changed into a prime (79044841) by changing a digit.

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, 15400 + ... + 19880.

Almost surely, 2^79044840 is an apocalyptic number.

79044840 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 79044840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (149452290).

79044840 is an abundant number, since it is smaller than the sum of its proper divisors (219859740).

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

79044840 is a wasteful number, since it uses less digits than its factorization.

79044840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4512 (or 4498 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 79044840 is about 8890.7165065590. The cubic root of 79044840 is about 429.1652093247.

The spelling of 79044840 in words is "seventy-nine million, forty-four thousand, eight hundred forty".