28113520 has 40 divisors (see below), whose sum is σ = 66763584. Its totient is φ = 11004672.

The previous prime is 28113457. The next prime is 28113523. The reversal of 28113520 is 2531182.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 28113491 and 28113500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28113523) 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, 22 + ... + 7498.

Almost surely, 2^28113520 is an apocalyptic number.

28113520 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 28113520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33381792).

28113520 is an abundant number, since it is smaller than the sum of its proper divisors (38650064).

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

28113520 is a wasteful number, since it uses less digits than its factorization.

28113520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7537 (or 7531 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 28113520 is about 5302.2184036496. The cubic root of 28113520 is about 304.0687171528.

The spelling of 28113520 in words is "twenty-eight million, one hundred thirteen thousand, five hundred twenty".