28561560 has 64 divisors (see below), whose sum is σ = 90201600. Its totient is φ = 7214976.

The previous prime is 28561531. The next prime is 28561609. The reversal of 28561560 is 6516582.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3984 + ... + 8543.

It is an arithmetic number, because the mean of its divisors is an integer number (1409400).

Almost surely, 2^28561560 is an apocalyptic number.

28561560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28561560 is an abundant number, since it is smaller than the sum of its proper divisors (61640040).

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

28561560 is a wasteful number, since it uses less digits than its factorization.

28561560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12560 (or 12556 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 33.

The square root of 28561560 is about 5344.3016381937. The cubic root of 28561560 is about 305.6755071868.

The spelling of 28561560 in words is "twenty-eight million, five hundred sixty-one thousand, five hundred sixty".