28085580 has 72 divisors (see below), whose sum is σ = 85630272. Its totient is φ = 7451136.

The previous prime is 28085569. The next prime is 28085609. The reversal of 28085580 is 8558082.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 60429 + ... + 60891.

Almost surely, 2^28085580 is an apocalyptic number.

28085580 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 28085580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42815136).

28085580 is an abundant number, since it is smaller than the sum of its proper divisors (57544692).

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

28085580 is a wasteful number, since it uses less digits than its factorization.

28085580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 815 (or 810 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 36.

The square root of 28085580 is about 5299.5830024635. The cubic root of 28085580 is about 303.9679531084.

The spelling of 28085580 in words is "twenty-eight million, eighty-five thousand, five hundred eighty".