28261116 has 48 divisors (see below), whose sum is σ = 78909600. Its totient is φ = 8695296.

The previous prime is 28261087. The next prime is 28261133. The reversal of 28261116 is 61116282.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 28261116.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8661 + ... + 11468.

It is an arithmetic number, because the mean of its divisors is an integer number (1643950).

Almost surely, 2^28261116 is an apocalyptic number.

28261116 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

28261116 is an abundant number, since it is smaller than the sum of its proper divisors (50648484).

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

28261116 is a wasteful number, since it uses less digits than its factorization.

28261116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20155 (or 20147 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 28261116 is about 5316.1185088371. The cubic root of 28261116 is about 304.5999089757.

Adding to 28261116 its reverse (61116282), we get a palindrome (89377398).

It can be divided in two parts, 2826 and 1116, that multiplied together give a triangular number (3153816 = T₂₅₁₁).

The spelling of 28261116 in words is "twenty-eight million, two hundred sixty-one thousand, one hundred sixteen".