79812500 has 42 divisors (see below), whose sum is σ = 174724326. Its totient is φ = 31900000.

The previous prime is 79812497. The next prime is 79812503. The reversal of 79812500 is 521897.

It is an interprime number because it is at equal distance from previous prime (79812497) and next prime (79812503).

It can be written as a sum of positive squares in 7 ways, for example, as 79637776 + 174724 = 8924^2 + 418^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79812503) by changing a digit.

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 13 ways as a sum of consecutive naturals, for example, 61862 + ... + 63138.

It is an arithmetic number, because the mean of its divisors is an integer number (4160103).

Almost surely, 2^79812500 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 79812500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87362163).

79812500 is an abundant number, since it is smaller than the sum of its proper divisors (94911826).

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

79812500 is an equidigital number, since it uses as much as digits as its factorization.

79812500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1311 (or 1284 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 79812500 is about 8933.7841926028. The cubic root of 79812500 is about 430.5500442506.

The spelling of 79812500 in words is "seventy-nine million, eight hundred twelve thousand, five hundred".