28104231 has 8 divisors (see below), whose sum is σ = 37724400. Its totient is φ = 18610112.

The previous prime is 28104199. The next prime is 28104239. The reversal of 28104231 is 13240182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28104231 - 2⁵ = 28104199 is a prime.

It is a super-2 number, since 2×28104231² = 1579695600202722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28104198 and 28104207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28104239) 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, 30990 + ... + 31883.

It is an arithmetic number, because the mean of its divisors is an integer number (4715550).

Almost surely, 2^28104231 is an apocalyptic number.

28104231 is a deficient number, since it is larger than the sum of its proper divisors (9620169).

28104231 is a wasteful number, since it uses less digits than its factorization.

28104231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63025.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 28104231 is about 5301.3423771720. The cubic root of 28104231 is about 304.0352243060.

The spelling of 28104231 in words is "twenty-eight million, one hundred four thousand, two hundred thirty-one".