81384446 has 16 divisors (see below), whose sum is σ = 143419248. Its totient is φ = 34147200.

The previous prime is 81384427. The next prime is 81384449. The reversal of 81384446 is 64448318.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81384449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 141995 + ... + 142566.

It is an arithmetic number, because the mean of its divisors is an integer number (8963703).

Almost surely, 2^81384446 is an apocalyptic number.

81384446 is a deficient number, since it is larger than the sum of its proper divisors (62034802).

81384446 is a wasteful number, since it uses less digits than its factorization.

81384446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284587.

The product of its digits is 73728, while the sum is 38.

The square root of 81384446 is about 9021.3328283575. The cubic root of 81384446 is about 433.3583182175.

The spelling of 81384446 in words is "eighty-one million, three hundred eighty-four thousand, four hundred forty-six".