79090020 has 60 divisors (see below), whose sum is σ = 248113404. Its totient is φ = 21090240.

The previous prime is 79090019. The next prime is 79090043. The reversal of 79090020 is 2009097.

It can be written as a sum of positive squares in 2 ways, for example, as 45077796 + 34012224 = 6714^2 + 5832^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 22791 + ... + 26030.

Almost surely, 2^79090020 is an apocalyptic number.

It is an amenable number.

79090020 is an abundant number, since it is smaller than the sum of its proper divisors (169023384).

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

79090020 is a wasteful number, since it uses less digits than its factorization.

79090020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48842 (or 48831 counting only the distinct ones).

The product of its (nonzero) digits is 1134, while the sum is 27.

The square root of 79090020 is about 8893.2569961741. The cubic root of 79090020 is about 429.2469603540.

The spelling of 79090020 in words is "seventy-nine million, ninety thousand, twenty".