81090608 has 20 divisors (see below), whose sum is σ = 158506968. Its totient is φ = 40185600.

The previous prime is 81090593. The next prime is 81090623. The reversal of 81090608 is 80609018.

It is an interprime number because it is at equal distance from previous prime (81090593) and next prime (81090623).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20618 + ... + 24233.

Almost surely, 2^81090608 is an apocalyptic number.

It is an amenable number.

81090608 is a deficient number, since it is larger than the sum of its proper divisors (77416360).

81090608 is a wasteful number, since it uses less digits than its factorization.

81090608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44972 (or 44966 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 81090608 is about 9005.0323708469. The cubic root of 81090608 is about 432.8361435028.

The spelling of 81090608 in words is "eighty-one million, ninety thousand, six hundred eight".