28870656 has 96 divisors (see below), whose sum is σ = 79672320. Its totient is φ = 9289728.

The previous prime is 28870649. The next prime is 28870661. The reversal of 28870656 is 65607882.

It is a tau number, because it is divible by the number of its divisors (96).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 227265 + ... + 227391.

It is an arithmetic number, because the mean of its divisors is an integer number (829920).

Almost surely, 2^28870656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28870656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39836160).

28870656 is an abundant number, since it is smaller than the sum of its proper divisors (50801664).

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

28870656 is a wasteful number, since it uses less digits than its factorization.

28870656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189 (or 169 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 42.

The square root of 28870656 is about 5373.1420975068. The cubic root of 28870656 is about 306.7742365753.

The spelling of 28870656 in words is "twenty-eight million, eight hundred seventy thousand, six hundred fifty-six".