81883768 has 16 divisors (see below), whose sum is σ = 161613000. Its totient is φ = 38786976.

The previous prime is 81883757. The next prime is 81883771. The reversal of 81883768 is 86738818.

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 3 ways as a sum of consecutive naturals, for example, 269203 + ... + 269506.

Almost surely, 2^81883768 is an apocalyptic number.

It is an amenable number.

81883768 is a deficient number, since it is larger than the sum of its proper divisors (79729232).

81883768 is a wasteful number, since it uses less digits than its factorization.

81883768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538734 (or 538730 counting only the distinct ones).

The product of its digits is 516096, while the sum is 49.

The square root of 81883768 is about 9048.9650236919. The cubic root of 81883768 is about 434.2427800601.

The spelling of 81883768 in words is "eighty-one million, eight hundred eighty-three thousand, seven hundred sixty-eight".