28745239 has 8 divisors (see below), whose sum is σ = 30562272. Its totient is φ = 26975520.

The previous prime is 28745231. The next prime is 28745257. The reversal of 28745239 is 93254782.

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 28745239 - 2³ = 28745231 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28745231) 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, 10572 + ... + 13009.

It is an arithmetic number, because the mean of its divisors is an integer number (3820284).

Almost surely, 2^28745239 is an apocalyptic number.

28745239 is a deficient number, since it is larger than the sum of its proper divisors (1817033).

28745239 is a wasteful number, since it uses less digits than its factorization.

28745239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23657.

The product of its digits is 120960, while the sum is 40.

The square root of 28745239 is about 5361.4586634609. The cubic root of 28745239 is about 306.3293725130.

The spelling of 28745239 in words is "twenty-eight million, seven hundred forty-five thousand, two hundred thirty-nine".