12279128500 has 24 divisors (see below), whose sum is σ = 26817617736. Its totient is φ = 4911651200.

The previous prime is 12279128483. The next prime is 12279128503. The reversal of 12279128500 is 582197221.

It can be written as a sum of positive squares in 4 ways, for example, as 54730404 + 12224398096 = 7398^2 + 110564^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 12279128500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12279128503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12278629 + ... + 12279628.

It is an arithmetic number, because the mean of its divisors is an integer number (1117400739).

Almost surely, 2^12279128500 is an apocalyptic number.

12279128500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12279128500 is an abundant number, since it is smaller than the sum of its proper divisors (14538489236).

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

12279128500 is a wasteful number, since it uses less digits than its factorization.

12279128500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24558276 (or 24558264 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 37.

The spelling of 12279128500 in words is "twelve billion, two hundred seventy-nine million, one hundred twenty-eight thousand, five hundred".