81342446 has 8 divisors (see below), whose sum is σ = 122109600. Its totient is φ = 40639248.

The previous prime is 81342431. The next prime is 81342451. The reversal of 81342446 is 64424318.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12671 + ... + 17978.

It is an arithmetic number, because the mean of its divisors is an integer number (15263700).

Almost surely, 2^81342446 is an apocalyptic number.

81342446 is a deficient number, since it is larger than the sum of its proper divisors (40767154).

81342446 is a wasteful number, since it uses less digits than its factorization.

81342446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31978.

The product of its digits is 18432, while the sum is 32.

The square root of 81342446 is about 9019.0047122729. The cubic root of 81342446 is about 433.2837577736.

The spelling of 81342446 in words is "eighty-one million, three hundred forty-two thousand, four hundred forty-six".