28113580 has 48 divisors (see below), whose sum is σ = 68203296. Its totient is φ = 9620480.

The previous prime is 28113571. The next prime is 28113601. The reversal of 28113580 is 8531182.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19 + ... + 7498.

It is an arithmetic number, because the mean of its divisors is an integer number (1420902).

Almost surely, 2^28113580 is an apocalyptic number.

28113580 is a gapful number since it is divisible by the number (20) 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 28113580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34101648).

28113580 is an abundant number, since it is smaller than the sum of its proper divisors (40089716).

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

28113580 is a wasteful number, since it uses less digits than its factorization.

28113580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7554 (or 7552 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 28113580 is about 5302.2240616556. The cubic root of 28113580 is about 304.0689334675.

It can be divided in two parts, 281 and 13580, that added together give a triangular number (13861 = T₁₆₆).

The spelling of 28113580 in words is "twenty-eight million, one hundred thirteen thousand, five hundred eighty".