81386734 has 32 divisors (see below), whose sum is σ = 143990784. Its totient is φ = 34013280.

The previous prime is 81386713. The next prime is 81386737. The reversal of 81386734 is 43768318.

Its product of digits (96768) is a multiple of the sum of its prime divisors (1152).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81386737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109167 + ... + 109909.

It is an arithmetic number, because the mean of its divisors is an integer number (4499712).

Almost surely, 2^81386734 is an apocalyptic number.

81386734 is a deficient number, since it is larger than the sum of its proper divisors (62604050).

81386734 is a wasteful number, since it uses less digits than its factorization.

81386734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1152.

The product of its digits is 96768, while the sum is 40.

The square root of 81386734 is about 9021.4596379965. The cubic root of 81386734 is about 433.3623792496.

The spelling of 81386734 in words is "eighty-one million, three hundred eighty-six thousand, seven hundred thirty-four".