28669539 has 4 divisors (see below), whose sum is σ = 38226056. Its totient is φ = 19113024.

The previous prime is 28669517. The next prime is 28669541. The reversal of 28669539 is 93596682.

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

It is not a de Polignac number, because 28669539 - 2⁸ = 28669283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28669559) 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, 4778254 + ... + 4778259.

It is an arithmetic number, because the mean of its divisors is an integer number (9556514).

Almost surely, 2^28669539 is an apocalyptic number.

28669539 is a deficient number, since it is larger than the sum of its proper divisors (9556517).

28669539 is an equidigital number, since it uses as much as digits as its factorization.

28669539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9556516.

The product of its digits is 699840, while the sum is 48.

The square root of 28669539 is about 5354.3943635112. The cubic root of 28669539 is about 306.0602320666.

The spelling of 28669539 in words is "twenty-eight million, six hundred sixty-nine thousand, five hundred thirty-nine".