28038705 has 16 divisors (see below), whose sum is σ = 44976384. Its totient is φ = 14915840.

The previous prime is 28038701. The next prime is 28038713. The reversal of 28038705 is 50783082.

It is not a de Polignac number, because 28038705 - 2² = 28038701 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (28038701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4297 + ... + 8633.

It is an arithmetic number, because the mean of its divisors is an integer number (2811024).

Almost surely, 2^28038705 is an apocalyptic number.

It is an amenable number.

28038705 is a deficient number, since it is larger than the sum of its proper divisors (16937679).

28038705 is a wasteful number, since it uses less digits than its factorization.

28038705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4776.

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 28038705 is about 5295.1586378502. The cubic root of 28038705 is about 303.7987508333.

The spelling of 28038705 in words is "twenty-eight million, thirty-eight thousand, seven hundred five".