28321760 has 24 divisors (see below), whose sum is σ = 66910536. Its totient is φ = 11328640.

The previous prime is 28321759. The next prime is 28321781. The reversal of 28321760 is 6712382.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88346 + ... + 88665.

It is an arithmetic number, because the mean of its divisors is an integer number (2787939).

Almost surely, 2^28321760 is an apocalyptic number.

28321760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28321760 is an abundant number, since it is smaller than the sum of its proper divisors (38588776).

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

28321760 is a wasteful number, since it uses less digits than its factorization.

28321760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177026 (or 177018 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 28321760 is about 5321.8192378171. The cubic root of 28321760 is about 304.8176281416.

The spelling of 28321760 in words is "twenty-eight million, three hundred twenty-one thousand, seven hundred sixty".