28520320 has 32 divisors (see below), whose sum is σ = 68182920. Its totient is φ = 11407872.

The previous prime is 28520293. The next prime is 28520321. The reversal of 28520320 is 2302582.

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 28520291 and 28520300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28520321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21642 + ... + 22921.

Almost surely, 2^28520320 is an apocalyptic number.

28520320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28520320 is an abundant number, since it is smaller than the sum of its proper divisors (39662600).

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

28520320 is an equidigital number, since it uses as much as digits as its factorization.

28520320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44582 (or 44570 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 28520320 is about 5340.4419292789. The cubic root of 28520320 is about 305.5283148289.

The spelling of 28520320 in words is "twenty-eight million, five hundred twenty thousand, three hundred twenty".