28187850 has 48 divisors (see below), whose sum is σ = 70566912. Its totient is φ = 7445760.

The previous prime is 28187807. The next prime is 28187893. The reversal of 28187850 is 5878182.

It is an interprime number because it is at equal distance from previous prime (28187807) and next prime (28187893).

It is a junction number, because it is equal to n+sod(n) for n = 28187799 and 28187808.

It is an unprimeable number.

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, 16119 + ... + 17781.

It is an arithmetic number, because the mean of its divisors is an integer number (1470144).

Almost surely, 2^28187850 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28187850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35283456).

28187850 is an abundant number, since it is smaller than the sum of its proper divisors (42379062).

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

28187850 is a wasteful number, since it uses less digits than its factorization.

28187850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1791 (or 1786 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 39.

The square root of 28187850 is about 5309.2231070092. The cubic root of 28187850 is about 304.3364594838.

The spelling of 28187850 in words is "twenty-eight million, one hundred eighty-seven thousand, eight hundred fifty".