28931085 has 24 divisors (see below), whose sum is σ = 51217920. Its totient is φ = 15100512.

The previous prime is 28931083. The next prime is 28931087. The reversal of 28931085 is 58013982.

It is an interprime number because it is at equal distance from previous prime (28931083) and next prime (28931087).

It is not a de Polignac number, because 28931085 - 2¹ = 28931083 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28931081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4725 + ... + 8954.

It is an arithmetic number, because the mean of its divisors is an integer number (2134080).

Almost surely, 2^28931085 is an apocalyptic number.

It is an amenable number.

28931085 is a deficient number, since it is larger than the sum of its proper divisors (22286835).

28931085 is a wasteful number, since it uses less digits than its factorization.

28931085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13737 (or 13734 counting only the distinct ones).

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

The square root of 28931085 is about 5378.7624041223. The cubic root of 28931085 is about 306.9881231988.

The spelling of 28931085 in words is "twenty-eight million, nine hundred thirty-one thousand, eighty-five".