28912144 has 20 divisors (see below), whose sum is σ = 57210624. Its totient is φ = 14148128.

The previous prime is 28912099. The next prime is 28912151. The reversal of 28912144 is 44121982.

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, 18472 + ... + 19975.

Almost surely, 2^28912144 is an apocalyptic number.

It is an amenable number.

28912144 is a deficient number, since it is larger than the sum of its proper divisors (28298480).

28912144 is a wasteful number, since it uses less digits than its factorization.

28912144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38502 (or 38496 counting only the distinct ones).

The product of its digits is 4608, while the sum is 31.

The square root of 28912144 is about 5377.0013948296. The cubic root of 28912144 is about 306.9211141732.

The spelling of 28912144 in words is "twenty-eight million, nine hundred twelve thousand, one hundred forty-four".