84415681 has 12 divisors (see below), whose sum is σ = 102468672. Its totient is φ = 69209448.

The previous prime is 84415637. The next prime is 84415717. The reversal of 84415681 is 18651448.

It is not a de Polignac number, because 84415681 - 2⁷ = 84415553 is a prime.

It is a super-2 number, since 2×84415681² = 14252014397387522, 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 84415681.

It is not an unprimeable number, because it can be changed into a prime (84415621) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36325 + ... + 38578.

It is an arithmetic number, because the mean of its divisors is an integer number (8539056).

Almost surely, 2^84415681 is an apocalyptic number.

It is an amenable number.

84415681 is a deficient number, since it is larger than the sum of its proper divisors (18052991).

84415681 is a wasteful number, since it uses less digits than its factorization.

84415681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74940 (or 74933 counting only the distinct ones).

The product of its digits is 30720, while the sum is 37.

The square root of 84415681 is about 9187.8006617471. The cubic root of 84415681 is about 438.6731394598.

The spelling of 84415681 in words is "eighty-four million, four hundred fifteen thousand, six hundred eighty-one".