81949482 has 60 divisors (see below), whose sum is σ = 188436930. Its totient is φ = 26618544.

The previous prime is 81949477. The next prime is 81949493. The reversal of 81949482 is 28494918.

81949482 is a `hidden beast` number, since 81 + 9 + 494 + 82 = 666.

It can be written as a sum of positive squares in only one way, i.e., 51710481 + 30239001 = 7191^2 + 5499^2 .

It is an unprimeable number.

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 29 ways as a sum of consecutive naturals, for example, 357744 + ... + 357972.

Almost surely, 2^81949482 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81949482, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94218465).

81949482 is an abundant number, since it is smaller than the sum of its proper divisors (106487448).

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

81949482 is a wasteful number, since it uses less digits than its factorization.

81949482 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337 (or 281 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 81949482 is about 9052.5953184708. The cubic root of 81949482 is about 434.3589129663.

The spelling of 81949482 in words is "eighty-one million, nine hundred forty-nine thousand, four hundred eighty-two".