28259532 has 72 divisors (see below), whose sum is σ = 82374656. Its totient is φ = 8001504.

The previous prime is 28259521. The next prime is 28259533. The reversal of 28259532 is 23595282.

It is a super-2 number, since 2×28259532² = 1597202297718048, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (28259533) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31563 + ... + 32445.

Almost surely, 2^28259532 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 28259532, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41187328).

28259532 is an abundant number, since it is smaller than the sum of its proper divisors (54115124).

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

28259532 is a wasteful number, since it uses less digits than its factorization.

28259532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1027 (or 1022 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 28259532 is about 5315.9695258720. The cubic root of 28259532 is about 304.5942180555.

It can be divided in two parts, 28 and 259532, that added together give a triangular number (259560 = T₇₂₀).

The spelling of 28259532 in words is "twenty-eight million, two hundred fifty-nine thousand, five hundred thirty-two".