72176721961388 has 24 divisors (see below), whose sum is σ = 140127380084160. Its totient is φ = 32251539858320.

The previous prime is 72176721961367. The next prime is 72176721961391. The reversal of 72176721961388 is 88316912767127.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13901523206 + ... + 13901528397.

It is an arithmetic number, because the mean of its divisors is an integer number (5838640836840).

Almost surely, 2^{72176721961388} is an apocalyptic number.

It is an amenable number.

72176721961388 is a deficient number, since it is larger than the sum of its proper divisors (67950658122772).

72176721961388 is a wasteful number, since it uses less digits than its factorization.

72176721961388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27803051677 (or 27803051675 counting only the distinct ones).

The product of its digits is 85349376, while the sum is 68.

The spelling of 72176721961388 in words is "seventy-two trillion, one hundred seventy-six billion, seven hundred twenty-one million, nine hundred sixty-one thousand, three hundred eighty-eight".