84987681 has 8 divisors (see below), whose sum is σ = 113549664. Its totient is φ = 56542080.

The previous prime is 84987659. The next prime is 84987689. The reversal of 84987681 is 18678948.

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

It is not a de Polignac number, because 84987681 - 2⁵ = 84987649 is a prime.

It is a super-2 number, since 2×84987681² = 14445811843515522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (84987689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27376 + ... + 30321.

It is an arithmetic number, because the mean of its divisors is an integer number (14193708).

Almost surely, 2^84987681 is an apocalyptic number.

It is an amenable number.

84987681 is a deficient number, since it is larger than the sum of its proper divisors (28561983).

84987681 is a wasteful number, since it uses less digits than its factorization.

84987681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58191.

The product of its digits is 774144, while the sum is 51.

The square root of 84987681 is about 9218.8763415071. The cubic root of 84987681 is about 439.6617251917.

The spelling of 84987681 in words is "eighty-four million, nine hundred eighty-seven thousand, six hundred eighty-one".