84127681 has 8 divisors (see below), whose sum is σ = 91905984. Its totient is φ = 76371120.

The previous prime is 84127663. The next prime is 84127691. The reversal of 84127681 is 18672148.

It is the 3745-th star number.

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 84127681 - 2¹¹ = 84125633 is a prime.

It is a super-2 number, since 2×84127681² = 14154933420875522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 84127681.

It is not an unprimeable number, because it can be changed into a prime (84127691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3276 + ... + 13378.

It is an arithmetic number, because the mean of its divisors is an integer number (11488248).

Almost surely, 2^84127681 is an apocalyptic number.

It is an amenable number.

84127681 is a deficient number, since it is larger than the sum of its proper divisors (7778303).

84127681 is a wasteful number, since it uses less digits than its factorization.

84127681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10871.

The product of its digits is 21504, while the sum is 37.

The square root of 84127681 is about 9172.1143145951. The cubic root of 84127681 is about 438.1736990291.

It can be divided in two parts, 84 and 127681, that added together give a triangular number (127765 = T₅₀₅).

The spelling of 84127681 in words is "eighty-four million, one hundred twenty-seven thousand, six hundred eighty-one".