28512432 has 80 divisors (see below), whose sum is σ = 88154080. Its totient is φ = 8771328.

The previous prime is 28512431. The next prime is 28512439. The reversal of 28512432 is 23421582.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 28512396 and 28512405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28512431) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3078 + ... + 8154.

It is an arithmetic number, because the mean of its divisors is an integer number (1101926).

Almost surely, 2^28512432 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 28512432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44077040).

28512432 is an abundant number, since it is smaller than the sum of its proper divisors (59641648).

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

28512432 is a wasteful number, since it uses less digits than its factorization.

28512432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5107 (or 5095 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 28512432 is about 5339.7033625474. The cubic root of 28512432 is about 305.5001450940.

It can be divided in two parts, 285124 and 32, that added together give a square (285156 = 534²).

The spelling of 28512432 in words is "twenty-eight million, five hundred twelve thousand, four hundred thirty-two".