81424338 has 8 divisors (see below), whose sum is σ = 162848688. Its totient is φ = 27141444.

The previous prime is 81424337. The next prime is 81424361. The reversal of 81424338 is 83342418.

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

81424338 is an admirable number.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 81424299 and 81424308.

It is not an unprimeable number, because it can be changed into a prime (81424337) 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, 6785356 + ... + 6785367.

It is an arithmetic number, because the mean of its divisors is an integer number (20356086).

Almost surely, 2^81424338 is an apocalyptic number.

81424338 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81424338 is a wasteful number, since it uses less digits than its factorization.

81424338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13570728.

The product of its digits is 18432, while the sum is 33.

The square root of 81424338 is about 9023.5435389873. The cubic root of 81424338 is about 433.4291126877.

It can be divided in two parts, 814 and 24338, that added together give a palindrome (25152).

The spelling of 81424338 in words is "eighty-one million, four hundred twenty-four thousand, three hundred thirty-eight".