28704870 has 48 divisors (see below), whose sum is σ = 75057840. Its totient is φ = 7611072.

The previous prime is 28704811. The next prime is 28704883. The reversal of 28704870 is 7840782.

It is a congruent 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, 16921 + ... + 18539.

It is an arithmetic number, because the mean of its divisors is an integer number (1563705).

Almost surely, 2^28704870 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28704870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37528920).

28704870 is an abundant number, since it is smaller than the sum of its proper divisors (46352970).

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

28704870 is a wasteful number, since it uses less digits than its factorization.

28704870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1829 (or 1826 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 36.

The square root of 28704870 is about 5357.6926003645. The cubic root of 28704870 is about 306.1859052316.

The spelling of 28704870 in words is "twenty-eight million, seven hundred four thousand, eight hundred seventy".