28159705 has 16 divisors (see below), whose sum is σ = 40299264. Its totient is φ = 18469440.

The previous prime is 28159699. The next prime is 28159723. The reversal of 28159705 is 50795182.

It is a de Polignac number, because none of the positive numbers 2^k-28159705 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16686 + ... + 18295.

It is an arithmetic number, because the mean of its divisors is an integer number (2518704).

Almost surely, 2^28159705 is an apocalyptic number.

It is an amenable number.

28159705 is a deficient number, since it is larger than the sum of its proper divisors (12139559).

28159705 is a wasteful number, since it uses less digits than its factorization.

28159705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35016.

The product of its (nonzero) digits is 25200, while the sum is 37.

The square root of 28159705 is about 5306.5718689188. The cubic root of 28159705 is about 304.2351344794.

The spelling of 28159705 in words is "twenty-eight million, one hundred fifty-nine thousand, seven hundred five".