28709339 has 4 divisors (see below), whose sum is σ = 29320224. Its totient is φ = 28098456.

The previous prime is 28709327. The next prime is 28709357. The reversal of 28709339 is 93390782.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28709339 is a prime.

It is a super-2 number, since 2×28709339² = 1648452291633842, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28709296 and 28709305.

It is not an unprimeable number, because it can be changed into a prime (28739339) 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, 305372 + ... + 305465.

It is an arithmetic number, because the mean of its divisors is an integer number (7330056).

Almost surely, 2^28709339 is an apocalyptic number.

28709339 is a deficient number, since it is larger than the sum of its proper divisors (610885).

28709339 is an equidigital number, since it uses as much as digits as its factorization.

28709339 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610884.

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 28709339 is about 5358.1096480009. The cubic root of 28709339 is about 306.2017942173.

The spelling of 28709339 in words is "twenty-eight million, seven hundred nine thousand, three hundred thirty-nine".