28491580 has 24 divisors (see below), whose sum is σ = 64435392. Its totient is φ = 10519872.

The previous prime is 28491577. The next prime is 28491599. The reversal of 28491580 is 8519482.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54532 + ... + 55051.

It is an arithmetic number, because the mean of its divisors is an integer number (2684808).

Almost surely, 2^28491580 is an apocalyptic number.

28491580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28491580 is an abundant number, since it is smaller than the sum of its proper divisors (35943812).

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

28491580 is a wasteful number, since it uses less digits than its factorization.

28491580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109605 (or 109603 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 28491580 is about 5337.7504625076. The cubic root of 28491580 is about 305.4256531135.

The spelling of 28491580 in words is "twenty-eight million, four hundred ninety-one thousand, five hundred eighty".