81938335 has 8 divisors (see below), whose sum is σ = 98573616. Its totient is φ = 65385600.

The previous prime is 81938321. The next prime is 81938341. The reversal of 81938335 is 53383918.

It is a happy number.

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

It is not a de Polignac number, because 81938335 - 2⁵ = 81938303 is a prime.

It is a Duffinian number.

It is a congruent 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, 18429 + ... + 22438.

It is an arithmetic number, because the mean of its divisors is an integer number (12321702).

Almost surely, 2^81938335 is an apocalyptic number.

81938335 is a deficient number, since it is larger than the sum of its proper divisors (16635281).

81938335 is a wasteful number, since it uses less digits than its factorization.

81938335 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41273.

The product of its digits is 77760, while the sum is 40.

The square root of 81938335 is about 9051.9796177411. The cubic root of 81938335 is about 434.3392178313.

The spelling of 81938335 in words is "eighty-one million, nine hundred thirty-eight thousand, three hundred thirty-five".