81093508 has 12 divisors (see below), whose sum is σ = 142031680. Its totient is φ = 40513032.

The previous prime is 81093503. The next prime is 81093511. The reversal of 81093508 is 80539018.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (81093503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2568 + ... + 12991.

Almost surely, 2^81093508 is an apocalyptic number.

It is an amenable number.

81093508 is a deficient number, since it is larger than the sum of its proper divisors (60938172).

81093508 is a wasteful number, since it uses less digits than its factorization.

81093508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16866 (or 16864 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 81093508 is about 9005.1933904831. The cubic root of 81093508 is about 432.8413032038.

The spelling of 81093508 in words is "eighty-one million, ninety-three thousand, five hundred eight".