81504284 has 12 divisors (see below), whose sum is σ = 143380608. Its totient is φ = 40538400.

The previous prime is 81504277. The next prime is 81504287. The reversal of 81504284 is 48240518.

It is a happy number.

81504284 is digitally balanced in base 9, because in such base it contains all the possibile digits an equal number of times.

81504284 is strictly pandigital in base 9.

It is a self number, because there is not a number n which added to its sum of digits gives 81504284.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81504287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52577 + ... + 54104.

It is an arithmetic number, because the mean of its divisors is an integer number (11948384).

Almost surely, 2^81504284 is an apocalyptic number.

It is an amenable number.

81504284 is a deficient number, since it is larger than the sum of its proper divisors (61876324).

81504284 is a wasteful number, since it uses less digits than its factorization.

81504284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106876 (or 106874 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 32.

The square root of 81504284 is about 9027.9723083315. The cubic root of 81504284 is about 433.5709195490.

The spelling of 81504284 in words is "eighty-one million, five hundred four thousand, two hundred eighty-four".