28245139 has 12 divisors (see below), whose sum is σ = 30918216. Its totient is φ = 25788672.

The previous prime is 28245079. The next prime is 28245157. The reversal of 28245139 is 93154282.

It is not a de Polignac number, because 28245139 - 2¹¹ = 28243091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28245169) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15532 + ... + 17254.

It is an arithmetic number, because the mean of its divisors is an integer number (2576518).

Almost surely, 2^28245139 is an apocalyptic number.

28245139 is a deficient number, since it is larger than the sum of its proper divisors (2673077).

28245139 is a wasteful number, since it uses less digits than its factorization.

28245139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1846 (or 1833 counting only the distinct ones).

The product of its digits is 17280, while the sum is 34.

The square root of 28245139 is about 5314.6156022802. The cubic root of 28245139 is about 304.5424978186.

The spelling of 28245139 in words is "twenty-eight million, two hundred forty-five thousand, one hundred thirty-nine".