28139085 has 48 divisors (see below), whose sum is σ = 53149824. Its totient is φ = 13689216.

The previous prime is 28139081. The next prime is 28139087. The reversal of 28139085 is 58093182.

It is not a de Polignac number, because 28139085 - 2² = 28139081 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28139081) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 60022 + ... + 60488.

It is an arithmetic number, because the mean of its divisors is an integer number (1107288).

Almost surely, 2^28139085 is an apocalyptic number.

It is an amenable number.

28139085 is a deficient number, since it is larger than the sum of its proper divisors (25010739).

28139085 is a wasteful number, since it uses less digits than its factorization.

28139085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 594 (or 591 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 28139085 is about 5304.6286392169. The cubic root of 28139085 is about 304.1608574191.

The spelling of 28139085 in words is "twenty-eight million, one hundred thirty-nine thousand, eighty-five".