81347886 has 24 divisors (see below), whose sum is σ = 178074624. Its totient is φ = 26835840.

The previous prime is 81347881. The next prime is 81347897. The reversal of 81347886 is 68874318.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81347881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21550 + ... + 25041.

It is an arithmetic number, because the mean of its divisors is an integer number (7419776).

Almost surely, 2^81347886 is an apocalyptic number.

81347886 is an abundant number, since it is smaller than the sum of its proper divisors (96726738).

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

81347886 is a wasteful number, since it uses less digits than its factorization.

81347886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46696 (or 46693 counting only the distinct ones).

The product of its digits is 258048, while the sum is 45.

The square root of 81347886 is about 9019.3062926147. The cubic root of 81347886 is about 433.2934165730.

The spelling of 81347886 in words is "eighty-one million, three hundred forty-seven thousand, eight hundred eighty-six".