28710870 has 64 divisors (see below), whose sum is σ = 72584640. Its totient is φ = 7257600.

The previous prime is 28710833. The next prime is 28710883. The reversal of 28710870 is 7801782.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 52800 + ... + 53340.

It is an arithmetic number, because the mean of its divisors is an integer number (1134135).

Almost surely, 2^28710870 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28710870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36292320).

28710870 is an abundant number, since it is smaller than the sum of its proper divisors (43873770).

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

28710870 is a wasteful number, since it uses less digits than its factorization.

28710870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641.

The product of its (nonzero) digits is 6272, while the sum is 33.

The square root of 28710870 is about 5358.2525136466. The cubic root of 28710870 is about 306.2072371223.

The spelling of 28710870 in words is "twenty-eight million, seven hundred ten thousand, eight hundred seventy".