28107256 has 32 divisors (see below), whose sum is σ = 56103840. Its totient is φ = 13155328.

The previous prime is 28107253. The next prime is 28107257. The reversal of 28107256 is 65270182.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28107253) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31245 + ... + 32131.

It is an arithmetic number, because the mean of its divisors is an integer number (1753245).

Almost surely, 2^28107256 is an apocalyptic number.

It is an amenable number.

28107256 is a deficient number, since it is larger than the sum of its proper divisors (27996584).

28107256 is a wasteful number, since it uses less digits than its factorization.

28107256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1143 (or 1139 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 28107256 is about 5301.6276745920. The cubic root of 28107256 is about 304.0461321957.

The spelling of 28107256 in words is "twenty-eight million, one hundred seven thousand, two hundred fifty-six".