81574445 has 12 divisors (see below), whose sum is σ = 102333756. Its totient is φ = 62420160.

The previous prime is 81574439. The next prime is 81574459. The reversal of 81574445 is 54447518.

It can be written as a sum of positive squares in 2 ways, for example, as 48246916 + 33327529 = 6946^2 + 5773^2 .

It is a de Polignac number, because none of the positive numbers 2^k-81574445 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81574399 and 81574408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12776 + ... + 18065.

It is an arithmetic number, because the mean of its divisors is an integer number (8527813).

Almost surely, 2^81574445 is an apocalyptic number.

It is an amenable number.

81574445 is a deficient number, since it is larger than the sum of its proper divisors (20759311).

81574445 is a wasteful number, since it uses less digits than its factorization.

81574445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30892 (or 30869 counting only the distinct ones).

The product of its digits is 89600, while the sum is 38.

The square root of 81574445 is about 9031.8572287210. The cubic root of 81574445 is about 433.6952935625.

The spelling of 81574445 in words is "eighty-one million, five hundred seventy-four thousand, four hundred forty-five".