28117965 has 32 divisors (see below), whose sum is σ = 47825280. Its totient is φ = 14079744.

The previous prime is 28117963. The next prime is 28117979. The reversal of 28117965 is 56971182.

It is not a de Polignac number, because 28117965 - 2¹ = 28117963 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28117963) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15222 + ... + 16968.

It is an arithmetic number, because the mean of its divisors is an integer number (1494540).

Almost surely, 2^28117965 is an apocalyptic number.

It is an amenable number.

28117965 is a deficient number, since it is larger than the sum of its proper divisors (19707315).

28117965 is a wasteful number, since it uses less digits than its factorization.

28117965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1821.

The product of its digits is 30240, while the sum is 39.

The square root of 28117965 is about 5302.6375512569. The cubic root of 28117965 is about 304.0847416399.

The spelling of 28117965 in words is "twenty-eight million, one hundred seventeen thousand, nine hundred sixty-five".