81364296 has 64 divisors (see below), whose sum is σ = 222203520. Its totient is φ = 24675840.

The previous prime is 81364277. The next prime is 81364303. The reversal of 81364296 is 69246318.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20316 + ... + 23988.

It is an arithmetic number, because the mean of its divisors is an integer number (3471930).

Almost surely, 2^81364296 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81364296, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111101760).

81364296 is an abundant number, since it is smaller than the sum of its proper divisors (140839224).

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

81364296 is a wasteful number, since it uses less digits than its factorization.

81364296 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3766 (or 3762 counting only the distinct ones).

The product of its digits is 62208, while the sum is 39.

The square root of 81364296 is about 9020.2159619379. The cubic root of 81364296 is about 433.3225501590.

The spelling of 81364296 in words is "eighty-one million, three hundred sixty-four thousand, two hundred ninety-six".