28180560 has 80 divisors (see below), whose sum is σ = 92511936. Its totient is φ = 7071744.

The previous prime is 28180549. The next prime is 28180601. The reversal of 28180560 is 6508182.

It is a tau number, because it is divible by the number of its divisors (80).

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 15 ways as a sum of consecutive naturals, for example, 627 + ... + 7533.

Almost surely, 2^28180560 is an apocalyptic number.

28180560 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 28180560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46255968).

28180560 is an abundant number, since it is smaller than the sum of its proper divisors (64331376).

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

28180560 is a wasteful number, since it uses less digits than its factorization.

28180560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6940 (or 6934 counting only the distinct ones).

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

The square root of 28180560 is about 5308.5365214906. The cubic root of 28180560 is about 304.3102211804.

The spelling of 28180560 in words is "twenty-eight million, one hundred eighty thousand, five hundred sixty".