79090900 has 54 divisors (see below), whose sum is σ = 199660398. Its totient is φ = 27115200.

The previous prime is 79090897. The next prime is 79090909. The reversal of 79090900 is 909097.

It can be written as a sum of positive squares in 3 ways, for example, as 3261636 + 75829264 = 1806^2 + 8708^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79090909) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3171 + ... + 12970.

Almost surely, 2^79090900 is an apocalyptic number.

79090900 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

79090900 is an abundant number, since it is smaller than the sum of its proper divisors (120569498).

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

79090900 is a wasteful number, since it uses less digits than its factorization.

79090900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16169 (or 16155 counting only the distinct ones).

The product of its (nonzero) digits is 5103, while the sum is 34.

The square root of 79090900 is about 8893.3064717236. The cubic root of 79090900 is about 429.2485523624.

Adding to 79090900 its reverse (909097), we get a palindrome (79999997).

The spelling of 79090900 in words is "seventy-nine million, ninety thousand, nine hundred".