28617705 has 40 divisors (see below), whose sum is σ = 54014400. Its totient is φ = 14455584.

The previous prime is 28617697. The next prime is 28617707. The reversal of 28617705 is 50771682.

It is not a de Polignac number, because 28617705 - 2³ = 28617697 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28617705.

It is not an unprimeable number, because it can be changed into a prime (28617707) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 5836 + ... + 9554.

It is an arithmetic number, because the mean of its divisors is an integer number (1350360).

Almost surely, 2^28617705 is an apocalyptic number.

It is an amenable number.

28617705 is a deficient number, since it is larger than the sum of its proper divisors (25396695).

28617705 is a wasteful number, since it uses less digits than its factorization.

28617705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3755 (or 3746 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The square root of 28617705 is about 5349.5518503890. The cubic root of 28617705 is about 305.8756703676.

The spelling of 28617705 in words is "twenty-eight million, six hundred seventeen thousand, seven hundred five".