28729170 has 48 divisors (see below), whose sum is σ = 75934872. Its totient is φ = 7534080.

The previous prime is 28729163. The next prime is 28729187. The reversal of 28729170 is 7192782.

It can be written as a sum of positive squares in 4 ways, for example, as 22838841 + 5890329 = 4779^2 + 2427^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2874 + ... + 8106.

Almost surely, 2^28729170 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28729170, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37967436).

28729170 is an abundant number, since it is smaller than the sum of its proper divisors (47205702).

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

28729170 is a wasteful number, since it uses less digits than its factorization.

28729170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5307 (or 5304 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 28729170 is about 5359.9598879096. The cubic root of 28729170 is about 306.2722810389.

The spelling of 28729170 in words is "twenty-eight million, seven hundred twenty-nine thousand, one hundred seventy".