28120617 has 24 divisors (see below), whose sum is σ = 47414016. Its totient is φ = 15725376.

The previous prime is 28120607. The next prime is 28120619. The reversal of 28120617 is 71602182.

28120617 is a `hidden beast` number, since 28 + 1 + 20 + 617 = 666.

It is not a de Polignac number, because 28120617 - 2¹¹ = 28118569 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28120619) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1788 + ... + 7709.

It is an arithmetic number, because the mean of its divisors is an integer number (1975584).

Almost surely, 2^28120617 is an apocalyptic number.

It is an amenable number.

28120617 is a deficient number, since it is larger than the sum of its proper divisors (19293399).

28120617 is a wasteful number, since it uses less digits than its factorization.

28120617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9557 (or 9554 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 28120617 is about 5302.8876095954. The cubic root of 28120617 is about 304.0943014520.

Adding to 28120617 its reverse (71602182), we get a palindrome (99722799).

The spelling of 28120617 in words is "twenty-eight million, one hundred twenty thousand, six hundred seventeen".