28274688 has 156 divisors (see below), whose sum is σ = 89445720. Its totient is φ = 8552448.

The previous prime is 28274671. The next prime is 28274699. The reversal of 28274688 is 88647282.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (156).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 479203 + ... + 479261.

It is an arithmetic number, because the mean of its divisors is an integer number (573370).

Almost surely, 2^28274688 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28274688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44722860).

28274688 is an abundant number, since it is smaller than the sum of its proper divisors (61171032).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28274688 is a wasteful number, since it uses less digits than its factorization.

28274688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102 (or 77 counting only the distinct ones).

The product of its digits is 344064, while the sum is 45.

The square root of 28274688 is about 5317.3948508645. The cubic root of 28274688 is about 304.6486611006.

The spelling of 28274688 in words is "twenty-eight million, two hundred seventy-four thousand, six hundred eighty-eight".