28403800 has 24 divisors (see below), whose sum is σ = 66039300. Its totient is φ = 11361440.

The previous prime is 28403783. The next prime is 28403807. The reversal of 28403800 is 830482.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28403807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 70810 + ... + 71209.

Almost surely, 2^28403800 is an apocalyptic number.

28403800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28403800 is an abundant number, since it is smaller than the sum of its proper divisors (37635500).

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

28403800 is a wasteful number, since it uses less digits than its factorization.

28403800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142035 (or 142026 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 28403800 is about 5329.5215545112. The cubic root of 28403800 is about 305.1116674332. Note that the first 3 decimals are identical.

The spelling of 28403800 in words is "twenty-eight million, four hundred three thousand, eight hundred".