28388700 has 54 divisors (see below), whose sum is σ = 88985624. Its totient is φ = 7570080.

The previous prime is 28388681. The next prime is 28388713. The reversal of 28388700 is 788382.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 14872 + ... + 16671.

Almost surely, 2^28388700 is an apocalyptic number.

28388700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28388700 is an abundant number, since it is smaller than the sum of its proper divisors (60596924).

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

28388700 is a wasteful number, since it uses less digits than its factorization.

28388700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31563 (or 31553 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 28388700 is about 5328.1047287004. The cubic root of 28388700 is about 305.0575901285.

The spelling of 28388700 in words is "twenty-eight million, three hundred eighty-eight thousand, seven hundred".