28081560 has 128 divisors (see below), whose sum is σ = 92897280. Its totient is φ = 6747648.

The previous prime is 28081523. The next prime is 28081589. The reversal of 28081560 is 6518082.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 73129 + ... + 73511.

It is an arithmetic number, because the mean of its divisors is an integer number (725760).

Almost surely, 2^28081560 is an apocalyptic number.

28081560 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 28081560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46448640).

28081560 is an abundant number, since it is smaller than the sum of its proper divisors (64815720).

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

28081560 is a wasteful number, since it uses less digits than its factorization.

28081560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457 (or 453 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 28081560 is about 5299.2037137668. The cubic root of 28081560 is about 303.9534497052.

It can be divided in two parts, 280815 and 60, that added together give a triangular number (280875 = T₇₄₉).

The spelling of 28081560 in words is "twenty-eight million, eighty-one thousand, five hundred sixty".