81418484 has 12 divisors (see below), whose sum is σ = 162837024. Its totient is φ = 34893624.

The previous prime is 81418481. The next prime is 81418487. The reversal of 81418484 is 48481418.

It is an interprime number because it is at equal distance from previous prime (81418481) and next prime (81418487).

81418484 is an admirable number.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81418481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1453874 + ... + 1453929.

It is an arithmetic number, because the mean of its divisors is an integer number (13569752).

Almost surely, 2^81418484 is an apocalyptic number.

It is an amenable number.

81418484 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

81418484 is a wasteful number, since it uses less digits than its factorization.

81418484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2907814 (or 2907812 counting only the distinct ones).

The product of its digits is 32768, while the sum is 38.

The square root of 81418484 is about 9023.2191594796. The cubic root of 81418484 is about 433.4187253150.

The spelling of 81418484 in words is "eighty-one million, four hundred eighteen thousand, four hundred eighty-four".