28187664 has 40 divisors (see below), whose sum is σ = 74599392. Its totient is φ = 9166080.

The previous prime is 28187611. The next prime is 28187669. The reversal of 28187664 is 46678182.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28187669) 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, 5194 + ... + 9129.

Almost surely, 2^28187664 is an apocalyptic number.

28187664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28187664 is an abundant number, since it is smaller than the sum of its proper divisors (46411728).

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

28187664 is a wasteful number, since it uses less digits than its factorization.

28187664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14375 (or 14369 counting only the distinct ones).

The product of its digits is 129024, while the sum is 42.

The square root of 28187664 is about 5309.2055902931. The cubic root of 28187664 is about 304.3357900854.

The spelling of 28187664 in words is "twenty-eight million, one hundred eighty-seven thousand, six hundred sixty-four".