81333334 has 8 divisors (see below), whose sum is σ = 122059728. Its totient is φ = 40646760.

The previous prime is 81333311. The next prime is 81333337. The reversal of 81333334 is 43333318.

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

It is a super-2 number, since 2×81333334² = 13230222439111112, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81333337) 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, 4177 + ... + 13420.

It is an arithmetic number, because the mean of its divisors is an integer number (15257466).

Almost surely, 2^81333334 is an apocalyptic number.

81333334 is a deficient number, since it is larger than the sum of its proper divisors (40726394).

81333334 is a wasteful number, since it uses less digits than its factorization.

81333334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19910.

The product of its digits is 7776, while the sum is 28.

The square root of 81333334 is about 9018.4995426069. The cubic root of 81333334 is about 433.2675783199.

The spelling of 81333334 in words is "eighty-one million, three hundred thirty-three thousand, three hundred thirty-four".