28752231 has 16 divisors (see below), whose sum is σ = 40573440. Its totient is φ = 18073440.

The previous prime is 28752211. The next prime is 28752239. The reversal of 28752231 is 13225782.

It is not a de Polignac number, because 28752231 - 2⁷ = 28752103 is a prime.

It is a super-2 number, since 2×28752231² = 1653381574954722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28752239) 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, 1965 + ... + 7833.

It is an arithmetic number, because the mean of its divisors is an integer number (2535840).

Almost surely, 2^28752231 is an apocalyptic number.

28752231 is a deficient number, since it is larger than the sum of its proper divisors (11821209).

28752231 is a wasteful number, since it uses less digits than its factorization.

28752231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5966.

The product of its digits is 6720, while the sum is 30.

The square root of 28752231 is about 5362.1106851687. The cubic root of 28752231 is about 306.3542077137.

The spelling of 28752231 in words is "twenty-eight million, seven hundred fifty-two thousand, two hundred thirty-one".