28526139 has 12 divisors (see below), whose sum is σ = 41269800. Its totient is φ = 18987264.

The previous prime is 28526129. The next prime is 28526171. The reversal of 28526139 is 93162582.

It is not a de Polignac number, because 28526139 - 2⁴ = 28526123 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28526129) 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, 4507 + ... + 8795.

It is an arithmetic number, because the mean of its divisors is an integer number (3439150).

Almost surely, 2^28526139 is an apocalyptic number.

28526139 is a deficient number, since it is larger than the sum of its proper divisors (12743661).

28526139 is a wasteful number, since it uses less digits than its factorization.

28526139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5034 (or 5031 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 28526139 is about 5340.9867065927. The cubic root of 28526139 is about 305.5490923934.

The spelling of 28526139 in words is "twenty-eight million, five hundred twenty-six thousand, one hundred thirty-nine".