81349376 has 18 divisors (see below), whose sum is σ = 162381492. Its totient is φ = 40674560.

The previous prime is 81349349. The next prime is 81349439. The reversal of 81349376 is 67394318.

81349376 is nontrivially palindromic in base 14.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158630 + ... + 159141.

It is an arithmetic number, because the mean of its divisors is an integer number (9021194).

Almost surely, 2^81349376 is an apocalyptic number.

It is an amenable number.

81349376 is a deficient number, since it is larger than the sum of its proper divisors (81032116).

81349376 is an equidigital number, since it uses as much as digits as its factorization.

81349376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317787 (or 317773 counting only the distinct ones).

The product of its digits is 108864, while the sum is 41.

The square root of 81349376 is about 9019.3888928242. The cubic root of 81349376 is about 433.2960620146.

The spelling of 81349376 in words is "eighty-one million, three hundred forty-nine thousand, three hundred seventy-six".