28985700 has 72 divisors (see below), whose sum is σ = 85494528. Its totient is φ = 7579520.

The previous prime is 28985683. The next prime is 28985701. The reversal of 28985700 is 758982.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (28985701) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14989 + ... + 16811.

It is an arithmetic number, because the mean of its divisors is an integer number (1187424).

Almost surely, 2^28985700 is an apocalyptic number.

28985700 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 28985700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42747264).

28985700 is an abundant number, since it is smaller than the sum of its proper divisors (56508828).

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

28985700 is a wasteful number, since it uses less digits than its factorization.

28985700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1893 (or 1886 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 39.

The square root of 28985700 is about 5383.8369217501. The cubic root of 28985700 is about 307.1811752652.

The spelling of 28985700 in words is "twenty-eight million, nine hundred eighty-five thousand, seven hundred".