81010446 has 16 divisors (see below), whose sum is σ = 176750208. Its totient is φ = 24548600.

The previous prime is 81010441. The next prime is 81010453. The reversal of 81010446 is 64401018.

It is a super-2 number, since 2×81010446² = 13125384722237832, which contains 22 as substring.

It is a congruent number.

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

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, 613650 + ... + 613781.

It is an arithmetic number, because the mean of its divisors is an integer number (11046888).

Almost surely, 2^81010446 is an apocalyptic number.

81010446 is an abundant number, since it is smaller than the sum of its proper divisors (95739762).

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

81010446 is a wasteful number, since it uses less digits than its factorization.

81010446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1227447.

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 81010446 is about 9000.5803146242. The cubic root of 81010446 is about 432.6934699705.

The spelling of 81010446 in words is "eighty-one million, ten thousand, four hundred forty-six".