81782256 has 40 divisors (see below), whose sum is σ = 215771904. Its totient is φ = 26680000.

The previous prime is 81782243. The next prime is 81782263. The reversal of 81782256 is 65228718.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15870 + ... + 20381.

Almost surely, 2^81782256 is an apocalyptic number.

It is an amenable number.

81782256 is an abundant number, since it is smaller than the sum of its proper divisors (133989648).

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

81782256 is a wasteful number, since it uses less digits than its factorization.

81782256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36309 (or 36303 counting only the distinct ones).

The product of its digits is 53760, while the sum is 39.

The square root of 81782256 is about 9043.3542449691. The cubic root of 81782256 is about 434.0632610397.

The spelling of 81782256 in words is "eighty-one million, seven hundred eighty-two thousand, two hundred fifty-six".