28816560 has 100 divisors (see below), whose sum is σ = 100106688. Its totient is φ = 7682688.

The previous prime is 28816549. The next prime is 28816561. The reversal of 28816560 is 6561882.

It is a happy number.

28816560 is a `hidden beast` number, since 2 + 88 + 16 + 560 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (28816561) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4257 + ... + 8703.

Almost surely, 2^28816560 is an apocalyptic number.

28816560 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 28816560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50053344).

28816560 is an abundant number, since it is smaller than the sum of its proper divisors (71290128).

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

28816560 is a wasteful number, since it uses less digits than its factorization.

28816560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4472 (or 4457 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 28816560 is about 5368.1058111777. The cubic root of 28816560 is about 306.5825120903.

The spelling of 28816560 in words is "twenty-eight million, eight hundred sixteen thousand, five hundred sixty".