28518505 has 16 divisors (see below), whose sum is σ = 36391680. Its totient is φ = 21406528.

The previous prime is 28518473. The next prime is 28518509. The reversal of 28518505 is 50581582.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 28518505 - 2⁵ = 28518473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28518509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3756 + ... + 8434.

It is an arithmetic number, because the mean of its divisors is an integer number (2274480).

Almost surely, 2^28518505 is an apocalyptic number.

It is an amenable number.

28518505 is a deficient number, since it is larger than the sum of its proper divisors (7873175).

28518505 is a wasteful number, since it uses less digits than its factorization.

28518505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4760.

The product of its (nonzero) digits is 16000, while the sum is 34.

The square root of 28518505 is about 5340.2719968181. The cubic root of 28518505 is about 305.5218335359.

The spelling of 28518505 in words is "twenty-eight million, five hundred eighteen thousand, five hundred five".