81445346 has 8 divisors (see below), whose sum is σ = 127479744. Its totient is φ = 38952100.

The previous prime is 81445279. The next prime is 81445349. The reversal of 81445346 is 64354418.

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

It is not an unprimeable number, because it can be changed into a prime (81445349) 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 3 ways as a sum of consecutive naturals, for example, 885230 + ... + 885321.

It is an arithmetic number, because the mean of its divisors is an integer number (15934968).

Almost surely, 2^81445346 is an apocalyptic number.

81445346 is a deficient number, since it is larger than the sum of its proper divisors (46034398).

81445346 is a wasteful number, since it uses less digits than its factorization.

81445346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1770576.

The product of its digits is 46080, while the sum is 35.

The square root of 81445346 is about 9024.7075298870. The cubic root of 81445346 is about 433.4663853101.

The spelling of 81445346 in words is "eighty-one million, four hundred forty-five thousand, three hundred forty-six".