28290101 has 6 divisors (see below), whose sum is σ = 32908950. Its totient is φ = 24248616.

The previous prime is 28290061. The next prime is 28290103. The reversal of 28290101 is 10109282.

It can be written as a sum of positive squares in only one way, i.e., 22791076 + 5499025 = 4774^2 + 2345^2 .

It is not a de Polignac number, because 28290101 - 2⁶ = 28290037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28290103) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 288626 + ... + 288723.

It is an arithmetic number, because the mean of its divisors is an integer number (5484825).

Almost surely, 2^28290101 is an apocalyptic number.

It is an amenable number.

28290101 is a deficient number, since it is larger than the sum of its proper divisors (4618849).

28290101 is an equidigital number, since it uses as much as digits as its factorization.

28290101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 577363 (or 577356 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 28290101 is about 5318.8439533417. The cubic root of 28290101 is about 304.7040073862.

Adding to 28290101 its reverse (10109282), we get a palindrome (38399383).

The spelling of 28290101 in words is "twenty-eight million, two hundred ninety thousand, one hundred one".