28156144 has 20 divisors (see below), whose sum is σ = 55583496. Its totient is φ = 13812032.

The previous prime is 28156133. The next prime is 28156159. The reversal of 28156144 is 44165182.

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, 15754 + ... + 17449.

Almost surely, 2^28156144 is an apocalyptic number.

It is an amenable number.

28156144 is a deficient number, since it is larger than the sum of its proper divisors (27427352).

28156144 is a wasteful number, since it uses less digits than its factorization.

28156144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33264 (or 33258 counting only the distinct ones).

The product of its digits is 7680, while the sum is 31.

The square root of 28156144 is about 5306.2363309600. The cubic root of 28156144 is about 304.2223096885. Note that the first 3 decimals are identical.

The spelling of 28156144 in words is "twenty-eight million, one hundred fifty-six thousand, one hundred forty-four".