81344438 has 8 divisors (see below), whose sum is σ = 139447632. Its totient is φ = 34861896.

The previous prime is 81344437. The next prime is 81344441. The reversal of 81344438 is 83444318.

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

It is a junction number, because it is equal to n+sod(n) for n = 81344398 and 81344407.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 2905145 + ... + 2905172.

It is an arithmetic number, because the mean of its divisors is an integer number (17430954).

Almost surely, 2^81344438 is an apocalyptic number.

81344438 is a deficient number, since it is larger than the sum of its proper divisors (58103194).

81344438 is a wasteful number, since it uses less digits than its factorization.

81344438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5810326.

The product of its digits is 36864, while the sum is 35.

The square root of 81344438 is about 9019.1151450683. The cubic root of 81344438 is about 433.2872946487.

The spelling of 81344438 in words is "eighty-one million, three hundred forty-four thousand, four hundred thirty-eight".