28499520 has 112 divisors (see below), whose sum is σ = 103436928. Its totient is φ = 6512640.

The previous prime is 28499479. The next prime is 28499539. The reversal of 28499520 is 2599482.

It is a tau number, because it is divible by the number of its divisors (112).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4600 + ... + 8840.

It is an arithmetic number, because the mean of its divisors is an integer number (923544).

Almost surely, 2^28499520 is an apocalyptic number.

28499520 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 28499520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51718464).

28499520 is an abundant number, since it is smaller than the sum of its proper divisors (74937408).

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

28499520 is a wasteful number, since it uses less digits than its factorization.

28499520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4268 (or 4258 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 28499520 is about 5338.4941697074. The cubic root of 28499520 is about 305.4540223656.

The spelling of 28499520 in words is "twenty-eight million, four hundred ninety-nine thousand, five hundred twenty".