81140338 has 8 divisors (see below), whose sum is σ = 121749120. Its totient is φ = 40557300.

The previous prime is 81140333. The next prime is 81140341. The reversal of 81140338 is 83304118.

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 (81140333) 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, 7363 + ... + 14713.

It is an arithmetic number, because the mean of its divisors is an integer number (15218640).

Almost surely, 2^81140338 is an apocalyptic number.

81140338 is a deficient number, since it is larger than the sum of its proper divisors (40608782).

81140338 is a wasteful number, since it uses less digits than its factorization.

81140338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12872.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 81140338 is about 9007.7931814624. The cubic root of 81140338 is about 432.9246064510.

The spelling of 81140338 in words is "eighty-one million, one hundred forty thousand, three hundred thirty-eight".