28748331 has 8 divisors (see below), whose sum is σ = 42590160. Its totient is φ = 19165536.

The previous prime is 28748327. The next prime is 28748333. The reversal of 28748331 is 13384782.

28748331 is a `hidden beast` number, since 287 + 48 + 331 = 666.

It is not a de Polignac number, because 28748331 - 2² = 28748327 is a prime.

It is a super-2 number, since 2×28748331² = 1652933070571122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28748333) 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, 532350 + ... + 532403.

It is an arithmetic number, because the mean of its divisors is an integer number (5323770).

Almost surely, 2^28748331 is an apocalyptic number.

28748331 is a deficient number, since it is larger than the sum of its proper divisors (13841829).

28748331 is a wasteful number, since it uses less digits than its factorization.

28748331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1064762 (or 1064756 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 28748331 is about 5361.7470100705. The cubic root of 28748331 is about 306.3403556241.

The spelling of 28748331 in words is "twenty-eight million, seven hundred forty-eight thousand, three hundred thirty-one".