72167447437640 has 64 divisors (see below), whose sum is σ = 172743157215360. Its totient is φ = 27040158673920.

The previous prime is 72167447437637. The next prime is 72167447437649. The reversal of 72167447437640 is 4673474476127.

It is not an unprimeable number, because it can be changed into a prime (72167447437649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 251346092 + ... + 251633051.

It is an arithmetic number, because the mean of its divisors is an integer number (2699111831490).

Almost surely, 2^{72167447437640} is an apocalyptic number.

It is an amenable number.

72167447437640 is an abundant number, since it is smaller than the sum of its proper divisors (100575709777720).

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

72167447437640 is a wasteful number, since it uses less digits than its factorization.

72167447437640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 502979382 (or 502979378 counting only the distinct ones).

The product of its (nonzero) digits is 132765696, while the sum is 62.

The spelling of 72167447437640 in words is "seventy-two trillion, one hundred sixty-seven billion, four hundred forty-seven million, four hundred thirty-seven thousand, six hundred forty".