28251472 has 20 divisors (see below), whose sum is σ = 55135360. Its totient is φ = 14023008.

The previous prime is 28251413. The next prime is 28251493. The reversal of 28251472 is 27415282.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4128 + ... + 8575.

It is an arithmetic number, because the mean of its divisors is an integer number (2756768).

Almost surely, 2^28251472 is an apocalyptic number.

It is an amenable number.

28251472 is a deficient number, since it is larger than the sum of its proper divisors (26883888).

28251472 is a wasteful number, since it uses less digits than its factorization.

28251472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12850 (or 12844 counting only the distinct ones).

The product of its digits is 8960, while the sum is 31.

The square root of 28251472 is about 5315.2113786754. The cubic root of 28251472 is about 304.5652571744.

The spelling of 28251472 in words is "twenty-eight million, two hundred fifty-one thousand, four hundred seventy-two".