84657681 has 12 divisors (see below), whose sum is σ = 122602740. Its totient is φ = 56291040.

The previous prime is 84657659. The next prime is 84657689. The reversal of 84657681 is 18675648.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 41216400 + 43441281 = 6420^2 + 6591^2 .

It is not a de Polignac number, because 84657681 - 2¹¹ = 84655633 is a prime.

It is a super-2 number, since 2×84657681² = 14333845904595522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (84657689) 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 11 ways as a sum of consecutive naturals, for example, 8590 + ... + 15591.

It is an arithmetic number, because the mean of its divisors is an integer number (10216895).

Almost surely, 2^84657681 is an apocalyptic number.

It is an amenable number.

84657681 is a deficient number, since it is larger than the sum of its proper divisors (37945059).

84657681 is a wasteful number, since it uses less digits than its factorization.

84657681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24576 (or 24573 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The square root of 84657681 is about 9200.9608737349. The cubic root of 84657681 is about 439.0919305956.

The spelling of 84657681 in words is "eighty-four million, six hundred fifty-seven thousand, six hundred eighty-one".