13087228 has 24 divisors (see below), whose sum is σ = 28554624. Its totient is φ = 5098800.

The previous prime is 13087213. The next prime is 13087259. The reversal of 13087228 is 82278031.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 13087228.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20938 + ... + 21553.

It is an arithmetic number, because the mean of its divisors is an integer number (1189776).

Almost surely, 2^13087228 is an apocalyptic number.

It is an amenable number.

13087228 is an abundant number, since it is smaller than the sum of its proper divisors (15467396).

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

13087228 is a wasteful number, since it uses less digits than its factorization.

13087228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42513 (or 42511 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 13087228 is about 3617.6273992770. The cubic root of 13087228 is about 235.6582000279.

The spelling of 13087228 in words is "thirteen million, eighty-seven thousand, two hundred twenty-eight".