28239432 has 32 divisors (see below), whose sum is σ = 76030080. Its totient is φ = 8688960.

The previous prime is 28239427. The next prime is 28239437. The reversal of 28239432 is 23493282.

It is an interprime number because it is at equal distance from previous prime (28239427) and next prime (28239437).

It is a junction number, because it is equal to n+sod(n) for n = 28239393 and 28239402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28239437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44944 + ... + 45567.

It is an arithmetic number, because the mean of its divisors is an integer number (2375940).

Almost surely, 2^28239432 is an apocalyptic number.

It is an amenable number.

28239432 is an abundant number, since it is smaller than the sum of its proper divisors (47790648).

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

28239432 is a wasteful number, since it uses less digits than its factorization.

28239432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90533 (or 90529 counting only the distinct ones).

The product of its digits is 20736, while the sum is 33.

The square root of 28239432 is about 5314.0786595608. The cubic root of 28239432 is about 304.5219852493.

The spelling of 28239432 in words is "twenty-eight million, two hundred thirty-nine thousand, four hundred thirty-two".