84681640 has 16 divisors (see below), whose sum is σ = 190533780. Its totient is φ = 33872640.

The previous prime is 84681589. The next prime is 84681671. The reversal of 84681640 is 4618648.

It can be written as a sum of positive squares in 2 ways, for example, as 76352644 + 8328996 = 8738^2 + 2886^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 84681640.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1058481 + ... + 1058560.

Almost surely, 2^84681640 is an apocalyptic number.

It is an amenable number.

84681640 is an abundant number, since it is smaller than the sum of its proper divisors (105852140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

84681640 is a wasteful number, since it uses less digits than its factorization.

84681640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2117052 (or 2117048 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 37.

The square root of 84681640 is about 9202.2627652116. The cubic root of 84681640 is about 439.1333492090.

The spelling of 84681640 in words is "eighty-four million, six hundred eighty-one thousand, six hundred forty".