28783800 has 72 divisors (see below), whose sum is σ = 96671640. Its totient is φ = 7675200.

The previous prime is 28783759. The next prime is 28783801. The reversal of 28783800 is 838782.

It is a tau number, because it is divible by the number of its divisors (72).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28783801) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 6196 + ... + 9795.

Almost surely, 2^28783800 is an apocalyptic number.

28783800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28783800 is an abundant number, since it is smaller than the sum of its proper divisors (67887840).

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

28783800 is a wasteful number, since it uses less digits than its factorization.

28783800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16013 (or 16001 counting only the distinct ones).

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

The square root of 28783800 is about 5365.0535878032. The cubic root of 28783800 is about 306.4662889704.

The spelling of 28783800 in words is "twenty-eight million, seven hundred eighty-three thousand, eight hundred".