28904400 has 360 divisors, whose sum is σ = 121531904. Its totient is φ = 6220800.

The previous prime is 28904371. The next prime is 28904411. The reversal of 28904400 is 440982.

It is a tau number, because it is divible by the number of its divisors (360).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 781182 + ... + 781218.

Almost surely, 2^28904400 is an apocalyptic number.

28904400 is a gapful number since it is divisible by the number (20) 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 28904400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60765952).

28904400 is an abundant number, since it is smaller than the sum of its proper divisors (92627504).

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

28904400 is a wasteful number, since it uses less digits than its factorization.

28904400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99 (or 85 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 28904400 is about 5376.2812426435. The cubic root of 28904400 is about 306.8937092029.

The spelling of 28904400 in words is "twenty-eight million, nine hundred four thousand, four hundred".