84818640 has 40 divisors (see below), whose sum is σ = 262938528. Its totient is φ = 22618240.

The previous prime is 84818639. The next prime is 84818681. The reversal of 84818640 is 4681848.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 176466 + ... + 176945.

Almost surely, 2^84818640 is an apocalyptic number.

84818640 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

84818640 is an abundant number, since it is smaller than the sum of its proper divisors (178119888).

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

84818640 is a wasteful number, since it uses less digits than its factorization.

84818640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353427 (or 353421 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 39.

The square root of 84818640 is about 9209.7035782918. The cubic root of 84818640 is about 439.3700351247.

It can be divided in two parts, 84818 and 640, that added together give a palindrome (85458).

The spelling of 84818640 in words is "eighty-four million, eight hundred eighteen thousand, six hundred forty".