81290484 has 72 divisors (see below), whose sum is σ = 226454592. Its totient is φ = 24382080.

The previous prime is 81290483. The next prime is 81290507. The reversal of 81290484 is 48409218.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81290483) 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 23 ways as a sum of consecutive naturals, for example, 39792 + ... + 41784.

Almost surely, 2^81290484 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81290484, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113227296).

81290484 is an abundant number, since it is smaller than the sum of its proper divisors (145164108).

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

81290484 is a wasteful number, since it uses less digits than its factorization.

81290484 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2117 (or 2112 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 81290484 is about 9016.1235572723. The cubic root of 81290484 is about 433.1914767751.

The spelling of 81290484 in words is "eighty-one million, two hundred ninety thousand, four hundred eighty-four".