81070845 has 16 divisors (see below), whose sum is σ = 129911040. Its totient is φ = 43171904.

The previous prime is 81070823. The next prime is 81070849. The reversal of 81070845 is 54807018.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 81070845 - 2²³ = 72682237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81070849) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7027 + ... + 14543.

It is an arithmetic number, because the mean of its divisors is an integer number (8119440).

Almost surely, 2^81070845 is an apocalyptic number.

It is an amenable number.

81070845 is a deficient number, since it is larger than the sum of its proper divisors (48840195).

81070845 is a wasteful number, since it uses less digits than its factorization.

81070845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8244.

The product of its (nonzero) digits is 8960, while the sum is 33.

The square root of 81070845 is about 9003.9349731104. The cubic root of 81070845 is about 432.8009777546.

The spelling of 81070845 in words is "eighty-one million, seventy thousand, eight hundred forty-five".