81736364 has 12 divisors (see below), whose sum is σ = 143143224. Its totient is φ = 40838304.

The previous prime is 81736363. The next prime is 81736381. The reversal of 81736364 is 46363718.

It is not an unprimeable number, because it can be changed into a prime (81736363) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 617 + ... + 12800.

It is an arithmetic number, because the mean of its divisors is an integer number (11928602).

Almost surely, 2^81736364 is an apocalyptic number.

It is an amenable number.

81736364 is a deficient number, since it is larger than the sum of its proper divisors (61406860).

81736364 is a wasteful number, since it uses less digits than its factorization.

81736364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14944 (or 14942 counting only the distinct ones).

The product of its digits is 72576, while the sum is 38.

The square root of 81736364 is about 9040.8165560418. The cubic root of 81736364 is about 433.9820545150.

The spelling of 81736364 in words is "eighty-one million, seven hundred thirty-six thousand, three hundred sixty-four".