79800813 has 12 divisors (see below), whose sum is σ = 115719708. Its totient is φ = 52992000.

The previous prime is 79800811. The next prime is 79800827. The reversal of 79800813 is 31800897.

It can be written as a sum of positive squares in 2 ways, for example, as 66536649 + 13264164 = 8157^2 + 3642^2 .

It is not a de Polignac number, because 79800813 - 2¹ = 79800811 is a prime.

79800813 is a modest number, since divided by 813 gives 798 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79800811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14938 + ... + 19563.

It is an arithmetic number, because the mean of its divisors is an integer number (9643309).

Almost surely, 2^79800813 is an apocalyptic number.

It is an amenable number.

79800813 is a deficient number, since it is larger than the sum of its proper divisors (35918895).

79800813 is a wasteful number, since it uses less digits than its factorization.

79800813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34764 (or 34761 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 79800813 is about 8933.1300785335. The cubic root of 79800813 is about 430.5290279770.

The spelling of 79800813 in words is "seventy-nine million, eight hundred thousand, eight hundred thirteen".