81693927 has 42 divisors (see below), whose sum is σ = 142544688. Its totient is φ = 46661832.

The previous prime is 81693923. The next prime is 81693961. The reversal of 81693927 is 72939618.

It is not a de Polignac number, because 81693927 - 2² = 81693923 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81693923) by changing a digit.

It is a polite number, since it can be written in 41 ways as a sum of consecutive naturals, for example, 34578 + ... + 36864.

Almost surely, 2^81693927 is an apocalyptic number.

81693927 is a deficient number, since it is larger than the sum of its proper divisors (60850761).

81693927 is an equidigital number, since it uses as much as digits as its factorization.

81693927 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2319 (or 2297 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 81693927 is about 9038.4692841211. The cubic root of 81693927 is about 433.9069346060.

The spelling of 81693927 in words is "eighty-one million, six hundred ninety-three thousand, nine hundred twenty-seven".