28117601 has 8 divisors (see below), whose sum is σ = 28667520. Its totient is φ = 27572688.

The previous prime is 28117597. The next prime is 28117619. The reversal of 28117601 is 10671182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28117601 - 2² = 28117597 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28117801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11270 + ... + 13536.

It is an arithmetic number, because the mean of its divisors is an integer number (3583440).

Almost surely, 2^28117601 is an apocalyptic number.

It is an amenable number.

28117601 is a deficient number, since it is larger than the sum of its proper divisors (549919).

28117601 is a wasteful number, since it uses less digits than its factorization.

28117601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2503.

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 28117601 is about 5302.6032286039. The cubic root of 28117601 is about 304.0834294619.

Adding to 28117601 its reverse (10671182), we get a palindrome (38788783).

The spelling of 28117601 in words is "twenty-eight million, one hundred seventeen thousand, six hundred one".