81070008 has 32 divisors (see below), whose sum is σ = 214598160. Its totient is φ = 25433600.

The previous prime is 81069977. The next prime is 81070027. The reversal of 81070008 is 80007018.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 81070008.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98943 + ... + 99758.

Almost surely, 2^81070008 is an apocalyptic number.

It is an amenable number.

81070008 is an abundant number, since it is smaller than the sum of its proper divisors (133528152).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81070008 is a wasteful number, since it uses less digits than its factorization.

81070008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198727 (or 198723 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 24.

The square root of 81070008 is about 9003.8884933122. Note that the first 3 decimals coincide. The cubic root of 81070008 is about 432.7994882932.

The spelling of 81070008 in words is "eighty-one million, seventy thousand, eight".