81682734 has 64 divisors (see below), whose sum is σ = 194688000. Its totient is φ = 22353408.

The previous prime is 81682709. The next prime is 81682751. The reversal of 81682734 is 43728618.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 81682692 and 81682701.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 242214 + ... + 242550.

It is an arithmetic number, because the mean of its divisors is an integer number (3042000).

Almost surely, 2^81682734 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81682734, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97344000).

81682734 is an abundant number, since it is smaller than the sum of its proper divisors (113005266).

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

81682734 is a wasteful number, since it uses less digits than its factorization.

81682734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 577.

The product of its digits is 64512, while the sum is 39.

The square root of 81682734 is about 9037.8500762073. The cubic root of 81682734 is about 433.8871169675.

The spelling of 81682734 in words is "eighty-one million, six hundred eighty-two thousand, seven hundred thirty-four".