28032539 has 8 divisors (see below), whose sum is σ = 28703808. Its totient is φ = 27364480.

The previous prime is 28032527. The next prime is 28032551. The reversal of 28032539 is 93523082.

It is an interprime number because it is at equal distance from previous prime (28032527) and next prime (28032551).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28032539 - 2⁴ = 28032523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28032839) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31379 + ... + 32259.

It is an arithmetic number, because the mean of its divisors is an integer number (3587976).

Almost surely, 2^28032539 is an apocalyptic number.

28032539 is a deficient number, since it is larger than the sum of its proper divisors (671269).

28032539 is an equidigital number, since it uses as much as digits as its factorization.

28032539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1605.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 28032539 is about 5294.5763758775. The cubic root of 28032539 is about 303.7764797093.

The spelling of 28032539 in words is "twenty-eight million, thirty-two thousand, five hundred thirty-nine".