28066718517 has 8 divisors (see below), whose sum is σ = 37560382080. Its totient is φ = 18642100320.

The previous prime is 28066718513. The next prime is 28066718569. The reversal of 28066718517 is 71581766082.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28066718517 - 2² = 28066718513 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28066718517.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28066718513) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17260392 + ... + 17262017.

It is an arithmetic number, because the mean of its divisors is an integer number (4695047760).

Almost surely, 2^28066718517 is an apocalyptic number.

It is an amenable number.

28066718517 is a deficient number, since it is larger than the sum of its proper divisors (9493663563).

28066718517 is a wasteful number, since it uses less digits than its factorization.

28066718517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34522683.

The product of its (nonzero) digits is 1128960, while the sum is 51.

The spelling of 28066718517 in words is "twenty-eight billion, sixty-six million, seven hundred eighteen thousand, five hundred seventeen".