28231086 has 32 divisors (see below), whose sum is σ = 61961760. Its totient is φ = 8521344.

The previous prime is 28231081. The next prime is 28231103. The reversal of 28231086 is 68013282.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28231081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 720 + ... + 7548.

It is an arithmetic number, because the mean of its divisors is an integer number (1936305).

Almost surely, 2^28231086 is an apocalyptic number.

28231086 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 28231086, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30980880).

28231086 is an abundant number, since it is smaller than the sum of its proper divisors (33730674).

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

28231086 is a wasteful number, since it uses less digits than its factorization.

28231086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6900.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 28231086 is about 5313.2933290004. The cubic root of 28231086 is about 304.4919823925.

The spelling of 28231086 in words is "twenty-eight million, two hundred thirty-one thousand, eighty-six".