28113331 has 16 divisors (see below), whose sum is σ = 30643200. Its totient is φ = 25704000.

The previous prime is 28113329. The next prime is 28113341. The reversal of 28113331 is 13331182.

It is a cyclic number.

It is not a de Polignac number, because 28113331 - 2¹ = 28113329 is a prime.

It is a super-2 number, since 2×28113331² = 1580718759831122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28113341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117510 + ... + 117748.

It is an arithmetic number, because the mean of its divisors is an integer number (1915200).

Almost surely, 2^28113331 is an apocalyptic number.

28113331 is a deficient number, since it is larger than the sum of its proper divisors (2529869).

28113331 is a wasteful number, since it uses less digits than its factorization.

28113331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450.

The product of its digits is 432, while the sum is 22.

The square root of 28113331 is about 5302.2005808909. The cubic root of 28113331 is about 304.0680357592.

The spelling of 28113331 in words is "twenty-eight million, one hundred thirteen thousand, three hundred thirty-one".