81010444 has 6 divisors (see below), whose sum is σ = 141768284. Its totient is φ = 40505220.

The previous prime is 81010441. The next prime is 81010453. The reversal of 81010444 is 44401018.

It is not an unprimeable number, because it can be changed into a prime (81010441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10126302 + ... + 10126309.

Almost surely, 2^81010444 is an apocalyptic number.

It is an amenable number.

81010444 is a deficient number, since it is larger than the sum of its proper divisors (60757840).

81010444 is a wasteful number, since it uses less digits than its factorization.

81010444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20252615 (or 20252613 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

The square root of 81010444 is about 9000.5802035202. The cubic root of 81010444 is about 432.6934664097.

The spelling of 81010444 in words is "eighty-one million, ten thousand, four hundred forty-four".