81445835 has 8 divisors (see below), whose sum is σ = 100887936. Its totient is φ = 63054720.

The previous prime is 81445817. The next prime is 81445841. The reversal of 81445835 is 53854418.

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

It is not a de Polignac number, because 81445835 - 2⁸ = 81445579 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 262574 + ... + 262883.

It is an arithmetic number, because the mean of its divisors is an integer number (12610992).

Almost surely, 2^81445835 is an apocalyptic number.

81445835 is a deficient number, since it is larger than the sum of its proper divisors (19442101).

81445835 is a wasteful number, since it uses less digits than its factorization.

81445835 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 525493.

The product of its digits is 76800, while the sum is 38.

The square root of 81445835 is about 9024.7346221371. The cubic root of 81445835 is about 433.4672528229.

The spelling of 81445835 in words is "eighty-one million, four hundred forty-five thousand, eight hundred thirty-five".