28329539 has 4 divisors (see below), whose sum is σ = 32376624. Its totient is φ = 24282456.

The previous prime is 28329487. The next prime is 28329541. The reversal of 28329539 is 93592382.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28329539 - 2⁸ = 28329283 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28329496 and 28329505.

It is not an unprimeable number, because it can be changed into a prime (28323539) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2023532 + ... + 2023545.

It is an arithmetic number, because the mean of its divisors is an integer number (8094156).

Almost surely, 2^28329539 is an apocalyptic number.

28329539 is a deficient number, since it is larger than the sum of its proper divisors (4047085).

28329539 is an equidigital number, since it uses as much as digits as its factorization.

28329539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4047084.

The product of its digits is 116640, while the sum is 41.

The square root of 28329539 is about 5322.5500467351. The cubic root of 28329539 is about 304.8455331785.

The spelling of 28329539 in words is "twenty-eight million, three hundred twenty-nine thousand, five hundred thirty-nine".