81795766 has 16 divisors (see below), whose sum is σ = 132804000. Its totient is φ = 37559808.

The previous prime is 81795757. The next prime is 81795781. The reversal of 81795766 is 66759718.

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, 2731 + ... + 13078.

It is an arithmetic number, because the mean of its divisors is an integer number (8300250).

Almost surely, 2^81795766 is an apocalyptic number.

81795766 is a deficient number, since it is larger than the sum of its proper divisors (51008234).

81795766 is a wasteful number, since it uses less digits than its factorization.

81795766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16023.

The product of its digits is 635040, while the sum is 49.

The square root of 81795766 is about 9044.1011714819. The cubic root of 81795766 is about 434.0871613822.

The spelling of 81795766 in words is "eighty-one million, seven hundred ninety-five thousand, seven hundred sixty-six".