28138042717 has 8 divisors (see below), whose sum is σ = 28907394656. Its totient is φ = 27369157392.

The previous prime is 28138042697. The next prime is 28138042733. The reversal of 28138042717 is 71724083182.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28138042717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28138042117) 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, 7378 + ... + 237340.

It is an arithmetic number, because the mean of its divisors is an integer number (3613424332).

Almost surely, 2^28138042717 is an apocalyptic number.

It is an amenable number.

28138042717 is a deficient number, since it is larger than the sum of its proper divisors (769351939).

28138042717 is a wasteful number, since it uses less digits than its factorization.

28138042717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233307.

The product of its (nonzero) digits is 150528, while the sum is 43.

The spelling of 28138042717 in words is "twenty-eight billion, one hundred thirty-eight million, forty-two thousand, seven hundred seventeen".