28283904 has 220 divisors, whose sum is σ = 95111808. Its totient is φ = 8294400.

The previous prime is 28283887. The next prime is 28283909. The reversal of 28283904 is 40938282.

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 (28283909) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 912369 + ... + 912399.

Almost surely, 2^28283904 is an apocalyptic number.

28283904 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28283904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47555904).

28283904 is an abundant number, since it is smaller than the sum of its proper divisors (66827904).

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

28283904 is a wasteful number, since it uses less digits than its factorization.

28283904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74 (or 47 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 28283904 is about 5318.2613700344. The cubic root of 28283904 is about 304.6817570989.

The spelling of 28283904 in words is "twenty-eight million, two hundred eighty-three thousand, nine hundred four".