28501320 has 64 divisors (see below), whose sum is σ = 86328000. Its totient is φ = 7527168.

The previous prime is 28501241. The next prime is 28501327. The reversal of 28501320 is 2310582.

It is not an unprimeable number, because it can be changed into a prime (28501327) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11991 + ... + 14169.

It is an arithmetic number, because the mean of its divisors is an integer number (1348875).

Almost surely, 2^28501320 is an apocalyptic number.

28501320 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 28501320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43164000).

28501320 is an abundant number, since it is smaller than the sum of its proper divisors (57826680).

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

28501320 is a wasteful number, since it uses less digits than its factorization.

28501320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2302 (or 2298 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 28501320 is about 5338.6627539113. The cubic root of 28501320 is about 305.4604529495.

The spelling of 28501320 in words is "twenty-eight million, five hundred one thousand, three hundred twenty".