81344433 has 8 divisors (see below), whose sum is σ = 110981728. Its totient is φ = 52968384.

The previous prime is 81344429. The next prime is 81344437. The reversal of 81344433 is 33444318.

It is an interprime number because it is at equal distance from previous prime (81344429) and next prime (81344437).

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

It is not a de Polignac number, because 81344433 - 2² = 81344429 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81344433.

It is not an unprimeable number, because it can be changed into a prime (81344437) 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, 315160 + ... + 315417.

It is an arithmetic number, because the mean of its divisors is an integer number (13872716).

Almost surely, 2^81344433 is an apocalyptic number.

It is an amenable number.

81344433 is a deficient number, since it is larger than the sum of its proper divisors (29637295).

81344433 is a wasteful number, since it uses less digits than its factorization.

81344433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630623.

The product of its digits is 13824, while the sum is 30.

The square root of 81344433 is about 9019.1148678792. The cubic root of 81344433 is about 433.2872857710.

The spelling of 81344433 in words is "eighty-one million, three hundred forty-four thousand, four hundred thirty-three".