28530432 has 216 divisors, whose sum is σ = 98847840. Its totient is φ = 7741440.

The previous prime is 28530421. The next prime is 28530433. The reversal of 28530432 is 23403582.

It is a junction number, because it is equal to n+sod(n) for n = 28530396 and 28530405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28530433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 467682 + ... + 467742.

Almost surely, 2^28530432 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 28530432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49423920).

28530432 is an abundant number, since it is smaller than the sum of its proper divisors (70317408).

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

28530432 is a wasteful number, since it uses less digits than its factorization.

28530432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119 (or 102 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 28530432 is about 5341.3885835052. The cubic root of 28530432 is about 305.5644193474.

The spelling of 28530432 in words is "twenty-eight million, five hundred thirty thousand, four hundred thirty-two".