28581984 has 60 divisors (see below), whose sum is σ = 84066444. Its totient is φ = 9526464.

The previous prime is 28581983. The next prime is 28582003. The reversal of 28581984 is 48918582.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28581983) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 2922 + ... + 8105.

Almost surely, 2^28581984 is an apocalyptic number.

28581984 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28581984 is an abundant number, since it is smaller than the sum of its proper divisors (55484460).

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

28581984 is a wasteful number, since it uses less digits than its factorization.

28581984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11049 (or 11032 counting only the distinct ones).

The product of its digits is 184320, while the sum is 45.

The square root of 28581984 is about 5346.2121170040. The cubic root of 28581984 is about 305.7483513524.

The spelling of 28581984 in words is "twenty-eight million, five hundred eighty-one thousand, nine hundred eighty-four".