79172020 has 12 divisors (see below), whose sum is σ = 166261284. Its totient is φ = 31668800.

The previous prime is 79172011. The next prime is 79172021. The reversal of 79172020 is 2027197.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 48944016 + 30228004 = 6996^2 + 5498^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 79172020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79172021) 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 3 ways as a sum of consecutive naturals, for example, 1979281 + ... + 1979320.

It is an arithmetic number, because the mean of its divisors is an integer number (13855107).

Almost surely, 2^79172020 is an apocalyptic number.

It is an amenable number.

79172020 is an abundant number, since it is smaller than the sum of its proper divisors (87089264).

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

79172020 is a wasteful number, since it uses less digits than its factorization.

79172020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3958610 (or 3958608 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 28.

The square root of 79172020 is about 8897.8660363033. The cubic root of 79172020 is about 429.3952559010.

It can be divided in two parts, 7917 and 2020, that multiplied together give a triangular number (15992340 = T₅₆₅₅).

The spelling of 79172020 in words is "seventy-nine million, one hundred seventy-two thousand, twenty".