81782476 has 6 divisors (see below), whose sum is σ = 143119340. Its totient is φ = 40891236.

The previous prime is 81782443. The next prime is 81782489. The reversal of 81782476 is 67428718.

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 as a sum of consecutive naturals, namely, 10222806 + ... + 10222813.

Almost surely, 2^81782476 is an apocalyptic number.

It is an amenable number.

81782476 is a deficient number, since it is larger than the sum of its proper divisors (61336864).

81782476 is a wasteful number, since it uses less digits than its factorization.

81782476 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20445623 (or 20445621 counting only the distinct ones).

The product of its digits is 150528, while the sum is 43.

The square root of 81782476 is about 9043.3664085892. The cubic root of 81782476 is about 434.0636502596.

The spelling of 81782476 in words is "eighty-one million, seven hundred eighty-two thousand, four hundred seventy-six".