28817850 has 48 divisors (see below), whose sum is σ = 74584512. Its totient is φ = 7349760.

The previous prime is 28817843. The next prime is 28817863. The reversal of 28817850 is 5871882.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28817799 and 28817808.

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 23 ways as a sum of consecutive naturals, for example, 727 + ... + 7626.

It is an arithmetic number, because the mean of its divisors is an integer number (1553844).

Almost surely, 2^28817850 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28817850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37292256).

28817850 is an abundant number, since it is smaller than the sum of its proper divisors (45766662).

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

28817850 is a wasteful number, since it uses less digits than its factorization.

28817850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8391 (or 8386 counting only the distinct ones).

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

The square root of 28817850 is about 5368.2259639475. The cubic root of 28817850 is about 306.5870868388.

It can be divided in two parts, 2881 and 7850, that added together give a triangular number (10731 = T₁₄₆).

The spelling of 28817850 in words is "twenty-eight million, eight hundred seventeen thousand, eight hundred fifty".