72171422072 has 32 divisors (see below), whose sum is σ = 136278979200. Its totient is φ = 35831197824.

The previous prime is 72171422047. The next prime is 72171422077. The reversal of 72171422072 is 27022417127.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72171422077) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 641978 + ... + 745974.

It is an arithmetic number, because the mean of its divisors is an integer number (4258718100).

Almost surely, 2^72171422072 is an apocalyptic number.

It is an amenable number.

72171422072 is a deficient number, since it is larger than the sum of its proper divisors (64107557128).

72171422072 is a wasteful number, since it uses less digits than its factorization.

72171422072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104615 (or 104611 counting only the distinct ones).

The product of its (nonzero) digits is 21952, while the sum is 35.

Adding to 72171422072 its reverse (27022417127), we get a palindrome (99193839199).

The spelling of 72171422072 in words is "seventy-two billion, one hundred seventy-one million, four hundred twenty-two thousand, seventy-two".