28065570 has 32 divisors (see below), whose sum is σ = 72539712. Its totient is φ = 6908352.

The previous prime is 28065539. The next prime is 28065581. The reversal of 28065570 is 7556082.

It is a happy 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 15 ways as a sum of consecutive naturals, for example, 35592 + ... + 36371.

It is an arithmetic number, because the mean of its divisors is an integer number (2266866).

Almost surely, 2^28065570 is an apocalyptic number.

28065570 is an abundant number, since it is smaller than the sum of its proper divisors (44474142).

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

28065570 is a wasteful number, since it uses less digits than its factorization.

28065570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71986.

The product of its (nonzero) digits is 16800, while the sum is 33.

The square root of 28065570 is about 5297.6947816951. The cubic root of 28065570 is about 303.8957470889.

The spelling of 28065570 in words is "twenty-eight million, sixty-five thousand, five hundred seventy".