28915233 has 16 divisors (see below), whose sum is σ = 40212480. Its totient is φ = 18458496.

The previous prime is 28915223. The next prime is 28915259. The reversal of 28915233 is 33251982.

It is not a de Polignac number, because 28915233 - 2⁴ = 28915217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28915194 and 28915203.

It is not an unprimeable number, because it can be changed into a prime (28915213) 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, 9741 + ... + 12357.

It is an arithmetic number, because the mean of its divisors is an integer number (2513280).

Almost surely, 2^28915233 is an apocalyptic number.

It is an amenable number.

28915233 is a deficient number, since it is larger than the sum of its proper divisors (11297247).

28915233 is a wasteful number, since it uses less digits than its factorization.

28915233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2776.

The product of its digits is 12960, while the sum is 33.

The square root of 28915233 is about 5377.2886290397. The cubic root of 28915233 is about 306.9320443618.

The spelling of 28915233 in words is "twenty-eight million, nine hundred fifteen thousand, two hundred thirty-three".