28101705 has 16 divisors (see below), whose sum is σ = 45074880. Its totient is φ = 14950208.

The previous prime is 28101701. The next prime is 28101719. The reversal of 28101705 is 50710182.

It is a cyclic number.

It is not a de Polignac number, because 28101705 - 2² = 28101701 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28101701) 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, 4531 + ... + 8759.

It is an arithmetic number, because the mean of its divisors is an integer number (2817180).

Almost surely, 2^28101705 is an apocalyptic number.

It is an amenable number.

28101705 is a deficient number, since it is larger than the sum of its proper divisors (16973175).

28101705 is a wasteful number, since it uses less digits than its factorization.

28101705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4680.

The product of its (nonzero) digits is 560, while the sum is 24.

The square root of 28101705 is about 5301.1041302732. The cubic root of 28101705 is about 304.0261151676.

Adding to 28101705 its reverse (50710182), we get a palindrome (78811887).

The spelling of 28101705 in words is "twenty-eight million, one hundred one thousand, seven hundred five".