28005670 has 64 divisors (see below), whose sum is σ = 64613376. Its totient is φ = 8484480.

The previous prime is 28005667. The next prime is 28005683. The reversal of 28005670 is 7650082.

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 31 ways as a sum of consecutive naturals, for example, 27999 + ... + 28981.

It is an arithmetic number, because the mean of its divisors is an integer number (1009584).

Almost surely, 2^28005670 is an apocalyptic number.

28005670 is an abundant number, since it is smaller than the sum of its proper divisors (36607706).

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

28005670 is a wasteful number, since it uses less digits than its factorization.

28005670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1045.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 28005670 is about 5292.0383596493. The cubic root of 28005670 is about 303.6793927797.

It can be divided in two parts, 280056 and 70, that added together give a triangular number (280126 = T₇₄₈).

The spelling of 28005670 in words is "twenty-eight million, five thousand, six hundred seventy".