28231588 has 48 divisors (see below), whose sum is σ = 62512128. Its totient is φ = 10836000.

The previous prime is 28231561. The next prime is 28231597. The reversal of 28231588 is 88513282.

It is a super-2 number, since 2×28231588² = 1594045122003488, which contains 22 as substring.

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, 21223 + ... + 22513.

It is an arithmetic number, because the mean of its divisors is an integer number (1302336).

Almost surely, 2^28231588 is an apocalyptic number.

28231588 is a gapful number since it is divisible by the number (28) 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 28231588, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31256064).

28231588 is an abundant number, since it is smaller than the sum of its proper divisors (34280540).

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

28231588 is a wasteful number, since it uses less digits than its factorization.

28231588 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1384 (or 1382 counting only the distinct ones).

The product of its digits is 30720, while the sum is 37.

The square root of 28231588 is about 5313.3405687947. The cubic root of 28231588 is about 304.4937871887.

The spelling of 28231588 in words is "twenty-eight million, two hundred thirty-one thousand, five hundred eighty-eight".