81173334 has 48 divisors (see below), whose sum is σ = 188972784. Its totient is φ = 23147520.

The previous prime is 81173329. The next prime is 81173347. The reversal of 81173334 is 43337118.

It is a super-2 number, since 2×81173334² = 13178220305351112, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9054 + ... + 15630.

It is an arithmetic number, because the mean of its divisors is an integer number (3936933).

Almost surely, 2^81173334 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81173334, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94486392).

81173334 is an abundant number, since it is smaller than the sum of its proper divisors (107799450).

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

81173334 is a wasteful number, since it uses less digits than its factorization.

81173334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6621 (or 6610 counting only the distinct ones).

The product of its digits is 6048, while the sum is 30.

The square root of 81173334 is about 9009.6245204781. The cubic root of 81173334 is about 432.9832819293.

The spelling of 81173334 in words is "eighty-one million, one hundred seventy-three thousand, three hundred thirty-four".