28426251 has 16 divisors (see below), whose sum is σ = 43400448. Its totient is φ = 16212000.

The previous prime is 28426213. The next prime is 28426253. The reversal of 28426251 is 15262482.

It is not a de Polignac number, because 28426251 - 2⁶ = 28426187 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28426253) 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, 13756 + ... + 15686.

It is an arithmetic number, because the mean of its divisors is an integer number (2712528).

Almost surely, 2^28426251 is an apocalyptic number.

28426251 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28426251 is a deficient number, since it is larger than the sum of its proper divisors (14974197).

28426251 is a wasteful number, since it uses less digits than its factorization.

28426251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2642.

The product of its digits is 7680, while the sum is 30.

The square root of 28426251 is about 5331.6274250926. The cubic root of 28426251 is about 305.1920352950.

The spelling of 28426251 in words is "twenty-eight million, four hundred twenty-six thousand, two hundred fifty-one".