79812100 has 18 divisors (see below), whose sum is σ = 173192474. Its totient is φ = 31924800.

The previous prime is 79812079. The next prime is 79812101. The reversal of 79812100 is 121897.

It can be written as a sum of positive squares in 3 ways, for example, as 6230016 + 73582084 = 2496^2 + 8578^2 .

It is not an unprimeable number, because it can be changed into a prime (79812101) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 398961 + ... + 399160.

Almost surely, 2^79812100 is an apocalyptic number.

It is an amenable number.

79812100 is an abundant number, since it is smaller than the sum of its proper divisors (93380374).

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

79812100 is a wasteful number, since it uses less digits than its factorization.

79812100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 798135 (or 798128 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 79812100 is about 8933.7618056449. The cubic root of 79812100 is about 430.5493249802.

Adding to 79812100 its reverse (121897), we get a palindrome (79933997).

The spelling of 79812100 in words is "seventy-nine million, eight hundred twelve thousand, one hundred".