28307232 has 120 divisors (see below), whose sum is σ = 85011696. Its totient is φ = 9237888.

The previous prime is 28307231. The next prime is 28307243. The reversal of 28307232 is 23270382.

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 = 28307196 and 28307205.

It is not an unprimeable number, because it can be changed into a prime (28307231) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 173583 + ... + 173745.

Almost surely, 2^28307232 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 28307232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42505848).

28307232 is an abundant number, since it is smaller than the sum of its proper divisors (56704464).

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

28307232 is a wasteful number, since it uses less digits than its factorization.

28307232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252 (or 235 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 28307232 is about 5320.4541159566. The cubic root of 28307232 is about 304.7654992260.

The spelling of 28307232 in words is "twenty-eight million, three hundred seven thousand, two hundred thirty-two".