84128717 has 8 divisors (see below), whose sum is σ = 85518720. Its totient is φ = 82747840.

The previous prime is 84128711. The next prime is 84128729. The reversal of 84128717 is 71782148.

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

It is a cyclic number.

It is not a de Polignac number, because 84128717 - 2¹⁴ = 84112333 is a prime.

It is a super-3 number, since 3×84128717³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84128711) 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, 17717 + ... + 21957.

It is an arithmetic number, because the mean of its divisors is an integer number (10689840).

Almost surely, 2^84128717 is an apocalyptic number.

It is an amenable number.

84128717 is a deficient number, since it is larger than the sum of its proper divisors (1390003).

84128717 is a wasteful number, since it uses less digits than its factorization.

84128717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4563.

The product of its digits is 25088, while the sum is 38.

The square root of 84128717 is about 9172.1707899493. The cubic root of 84128717 is about 438.1754976685.

The spelling of 84128717 in words is "eighty-four million, one hundred twenty-eight thousand, seven hundred seventeen".