79639220 has 96 divisors (see below), whose sum is σ = 188606880. Its totient is φ = 28098560.

The previous prime is 79639213. The next prime is 79639229. The reversal of 79639220 is 2293697.

It can be written as a sum of positive squares in 16 ways, for example, as 5438224 + 74200996 = 2332^2 + 8614^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79639229) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 404162 + ... + 404358.

It is an arithmetic number, because the mean of its divisors is an integer number (1964655).

Almost surely, 2^79639220 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 79639220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94303440).

79639220 is an abundant number, since it is smaller than the sum of its proper divisors (108967660).

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

79639220 is a wasteful number, since it uses less digits than its factorization.

79639220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293 (or 291 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 38.

The square root of 79639220 is about 8924.0809050568. The cubic root of 79639220 is about 430.2382310686.

The spelling of 79639220 in words is "seventy-nine million, six hundred thirty-nine thousand, two hundred twenty".