28678251 has 16 divisors (see below), whose sum is σ = 44048384. Its totient is φ = 16257024.

The previous prime is 28678213. The next prime is 28678253. The reversal of 28678251 is 15287682.

It is not a de Polignac number, because 28678251 - 2⁹ = 28677739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28678253) 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, 2710 + ... + 8043.

It is an arithmetic number, because the mean of its divisors is an integer number (2753024).

Almost surely, 2^28678251 is an apocalyptic number.

28678251 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28678251 is a deficient number, since it is larger than the sum of its proper divisors (15370133).

28678251 is a wasteful number, since it uses less digits than its factorization.

28678251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10890.

The product of its digits is 53760, while the sum is 39.

The square root of 28678251 is about 5355.2078391039. The cubic root of 28678251 is about 306.0912304339.

The spelling of 28678251 in words is "twenty-eight million, six hundred seventy-eight thousand, two hundred fifty-one".