28523500 has 24 divisors (see below), whose sum is σ = 62296416. Its totient is φ = 11409200.

The previous prime is 28523477. The next prime is 28523507. The reversal of 28523500 is 532582.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (28523507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28024 + ... + 29023.

It is an arithmetic number, because the mean of its divisors is an integer number (2595684).

Almost surely, 2^28523500 is an apocalyptic number.

28523500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28523500 is an abundant number, since it is smaller than the sum of its proper divisors (33772916).

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

28523500 is a wasteful number, since it uses less digits than its factorization.

28523500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57066 (or 57054 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 28523500 is about 5340.7396491497. The cubic root of 28523500 is about 305.5396698200.

The spelling of 28523500 in words is "twenty-eight million, five hundred twenty-three thousand, five hundred".