81008104 has 16 divisors (see below), whose sum is σ = 151985700. Its totient is φ = 40478592.

The previous prime is 81008071. The next prime is 81008129. The reversal of 81008104 is 40180018.

It can be written as a sum of positive squares in 2 ways, for example, as 80964004 + 44100 = 8998^2 + 210^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23244 + ... + 26500.

Almost surely, 2^81008104 is an apocalyptic number.

It is an amenable number.

81008104 is a deficient number, since it is larger than the sum of its proper divisors (70977596).

81008104 is a wasteful number, since it uses less digits than its factorization.

81008104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6372 (or 6368 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 22.

The square root of 81008104 is about 9000.4502109617. The cubic root of 81008104 is about 432.6893002289.

The spelling of 81008104 in words is "eighty-one million, eight thousand, one hundred four".