28872688 has 40 divisors (see below), whose sum is σ = 60773888. Its totient is φ = 13208832.

The previous prime is 28872643. The next prime is 28872689. The reversal of 28872688 is 88627882.

It is a super-2 number, since 2×28872688² = 1667264224690688, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28872689) 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, 25870 + ... + 26962.

Almost surely, 2^28872688 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 28872688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30386944).

28872688 is an abundant number, since it is smaller than the sum of its proper divisors (31901200).

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

28872688 is a wasteful number, since it uses less digits than its factorization.

28872688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1241 (or 1235 counting only the distinct ones).

The product of its digits is 688128, while the sum is 49.

The square root of 28872688 is about 5373.3311827953. The cubic root of 28872688 is about 306.7814336248.

The spelling of 28872688 in words is "twenty-eight million, eight hundred seventy-two thousand, six hundred eighty-eight".