81487296 has 140 divisors (see below), whose sum is σ = 263697720. Its totient is φ = 24675840.

The previous prime is 81487271. The next prime is 81487349. The reversal of 81487296 is 69278418.

81487296 is a `hidden beast` number, since 81 + 487 + 2 + 96 = 666.

It is a congruent number.

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 19 ways as a sum of consecutive naturals, for example, 56310 + ... + 57738.

Almost surely, 2^81487296 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 81487296, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (131848860).

81487296 is an abundant number, since it is smaller than the sum of its proper divisors (182210424).

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

81487296 is a wasteful number, since it uses less digits than its factorization.

81487296 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1464 (or 1445 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 81487296 is about 9027.0314057280. The cubic root of 81487296 is about 433.5407942836.

The spelling of 81487296 in words is "eighty-one million, four hundred eighty-seven thousand, two hundred ninety-six".