28389300 has 72 divisors (see below), whose sum is σ = 82765536. Its totient is φ = 7512960.

The previous prime is 28389299. The next prime is 28389313. The reversal of 28389300 is 398382.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 51627 + ... + 52173.

Almost surely, 2^28389300 is an apocalyptic number.

28389300 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 28389300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41382768).

28389300 is an abundant number, since it is smaller than the sum of its proper divisors (54376236).

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

28389300 is a wasteful number, since it uses less digits than its factorization.

28389300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 737 (or 730 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 28389300 is about 5328.1610336025. The cubic root of 28389300 is about 305.0597392613.

The spelling of 28389300 in words is "twenty-eight million, three hundred eighty-nine thousand, three hundred".