28013517 has 24 divisors (see below), whose sum is σ = 48257664. Its totient is φ = 15310944.

The previous prime is 28013509. The next prime is 28013519. The reversal of 28013517 is 71531082.

It is not a de Polignac number, because 28013517 - 2³ = 28013509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28013519) 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, 8218 + ... + 11115.

It is an arithmetic number, because the mean of its divisors is an integer number (2010736).

Almost surely, 2^28013517 is an apocalyptic number.

It is an amenable number.

28013517 is a deficient number, since it is larger than the sum of its proper divisors (20244147).

28013517 is a wasteful number, since it uses less digits than its factorization.

28013517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19369 (or 19366 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 28013517 is about 5292.7797044653. The cubic root of 28013517 is about 303.7077531042.

Adding to 28013517 its reverse (71531082), we get a palindrome (99544599).

The spelling of 28013517 in words is "twenty-eight million, thirteen thousand, five hundred seventeen".