81068294272 has 32 divisors (see below), whose sum is σ = 184575136320. Its totient is φ = 34743554304.

The previous prime is 81068294269. The next prime is 81068294303. The reversal of 81068294272 is 27249286018.

It is a tau number, because it is divible by the number of its divisors (32).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45238108 + ... + 45239899.

It is an arithmetic number, because the mean of its divisors is an integer number (5767973010).

Almost surely, 2^81068294272 is an apocalyptic number.

It is an amenable number.

81068294272 is an abundant number, since it is smaller than the sum of its proper divisors (103506842048).

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

81068294272 is an equidigital number, since it uses as much as digits as its factorization.

81068294272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90478028 (or 90478016 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 49.

The spelling of 81068294272 in words is "eighty-one billion, sixty-eight million, two hundred ninety-four thousand, two hundred seventy-two".