28117518 has 32 divisors (see below), whose sum is σ = 66068352. Its totient is φ = 7864800.

The previous prime is 28117493. The next prime is 28117519. The reversal of 28117518 is 81571182.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28117519) 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 15 ways as a sum of consecutive naturals, for example, 15528 + ... + 17243.

It is an arithmetic number, because the mean of its divisors is an integer number (2064636).

Almost surely, 2^28117518 is an apocalyptic number.

28117518 is an abundant number, since it is smaller than the sum of its proper divisors (37950834).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28117518 is a wasteful number, since it uses less digits than its factorization.

28117518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32800.

The product of its digits is 4480, while the sum is 33.

The square root of 28117518 is about 5302.5954022535. The cubic root of 28117518 is about 304.0831302549.

The spelling of 28117518 in words is "twenty-eight million, one hundred seventeen thousand, five hundred eighteen".