28559920 has 20 divisors (see below), whose sum is σ = 66402000. Its totient is φ = 11423936.

The previous prime is 28559917. The next prime is 28559929. The reversal of 28559920 is 2995582.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28559929) 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, 178420 + ... + 178579.

It is an arithmetic number, because the mean of its divisors is an integer number (3320100).

Almost surely, 2^28559920 is an apocalyptic number.

28559920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28559920 is an abundant number, since it is smaller than the sum of its proper divisors (37842080).

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

28559920 is a wasteful number, since it uses less digits than its factorization.

28559920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357012 (or 357006 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 40.

The square root of 28559920 is about 5344.1482015378. The cubic root of 28559920 is about 305.6696564626.

The spelling of 28559920 in words is "twenty-eight million, five hundred fifty-nine thousand, nine hundred twenty".