28980870 has 16 divisors (see below), whose sum is σ = 69554160. Its totient is φ = 7728224.

The previous prime is 28980841. The next prime is 28980881. The reversal of 28980870 is 7808982.

It is a happy number.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 482985 + ... + 483044.

It is an arithmetic number, because the mean of its divisors is an integer number (4347135).

Almost surely, 2^28980870 is an apocalyptic number.

28980870 is an abundant number, since it is smaller than the sum of its proper divisors (40573290).

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

28980870 is a wasteful number, since it uses less digits than its factorization.

28980870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 966039.

The product of its (nonzero) digits is 64512, while the sum is 42.

The square root of 28980870 is about 5383.3883382123. The cubic root of 28980870 is about 307.1641120525.

The spelling of 28980870 in words is "twenty-eight million, nine hundred eighty thousand, eight hundred seventy".