81927868 has 24 divisors (see below), whose sum is σ = 158747904. Its totient is φ = 36682800.

The previous prime is 81927847. The next prime is 81927883. The reversal of 81927868 is 86872918.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10948 + ... + 16843.

It is an arithmetic number, because the mean of its divisors is an integer number (6614496).

Almost surely, 2^81927868 is an apocalyptic number.

It is an amenable number.

81927868 is a deficient number, since it is larger than the sum of its proper divisors (76820036).

81927868 is a wasteful number, since it uses less digits than its factorization.

81927868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27873 (or 27871 counting only the distinct ones).

The product of its digits is 387072, while the sum is 49.

The square root of 81927868 is about 9051.4014384514. The cubic root of 81927868 is about 434.3207225316.

The spelling of 81927868 in words is "eighty-one million, nine hundred twenty-seven thousand, eight hundred sixty-eight".