79209040 has 40 divisors (see below), whose sum is σ = 184753800. Its totient is φ = 31581696.

The previous prime is 79209029. The next prime is 79209041. The reversal of 79209040 is 4090297.

It can be written as a sum of positive squares in 4 ways, for example, as 1628176 + 77580864 = 1276^2 + 8808^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 79208993 and 79209011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79209041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26502 + ... + 29338.

It is an arithmetic number, because the mean of its divisors is an integer number (4618845).

Almost surely, 2^79209040 is an apocalyptic number.

It is an amenable number.

79209040 is an abundant number, since it is smaller than the sum of its proper divisors (105544760).

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

79209040 is a wasteful number, since it uses less digits than its factorization.

79209040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3199 (or 3193 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 79209040 is about 8899.9460672523. The cubic root of 79209040 is about 429.4621723671.

The spelling of 79209040 in words is "seventy-nine million, two hundred nine thousand, forty".