28931136 has 112 divisors (see below), whose sum is σ = 84149184. Its totient is φ = 8718336.

The previous prime is 28931099. The next prime is 28931191. The reversal of 28931136 is 63113982.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 28931097 and 28931106.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 167146 + ... + 167318.

It is an arithmetic number, because the mean of its divisors is an integer number (751332).

Almost surely, 2^28931136 is an apocalyptic number.

28931136 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28931136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42074592).

28931136 is an abundant number, since it is smaller than the sum of its proper divisors (55218048).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28931136 is a wasteful number, since it uses less digits than its factorization.

28931136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268 (or 258 counting only the distinct ones).

The product of its digits is 7776, while the sum is 33.

The square root of 28931136 is about 5378.7671449878. The cubic root of 28931136 is about 306.9883035859.

The spelling of 28931136 in words is "twenty-eight million, nine hundred thirty-one thousand, one hundred thirty-six".