28591488 has 64 divisors (see below), whose sum is σ = 84394800. Its totient is φ = 9529344.

The previous prime is 28591483. The next prime is 28591529. The reversal of 28591488 is 88419582.

It is a happy number.

28591488 is a `hidden beast` number, since 2 + 85 + 91 + 488 = 666.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28591483) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 681 + ... + 7592.

Almost surely, 2^28591488 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28591488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42197400).

28591488 is an abundant number, since it is smaller than the sum of its proper divisors (55803312).

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

28591488 is an equidigital number, since it uses as much as digits as its factorization.

28591488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8296 (or 8278 counting only the distinct ones).

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

The square root of 28591488 is about 5347.1008967477. The cubic root of 28591488 is about 305.7822364542.

The spelling of 28591488 in words is "twenty-eight million, five hundred ninety-one thousand, four hundred eighty-eight".