72671387728 has 40 divisors (see below), whose sum is σ = 141282797600. Its totient is φ = 36211432320.

The previous prime is 72671387669. The next prime is 72671387729. The reversal of 72671387728 is 82778317627.

It is a super-2 number, since 2×72671387728² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72671387729) 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, 18598351 + ... + 18602257.

It is an arithmetic number, because the mean of its divisors is an integer number (3532069940).

Almost surely, 2^72671387728 is an apocalyptic number.

It is an amenable number.

72671387728 is a deficient number, since it is larger than the sum of its proper divisors (68611409872).

72671387728 is a wasteful number, since it uses less digits than its factorization.

72671387728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7595 (or 7589 counting only the distinct ones).

The product of its digits is 11063808, while the sum is 58.

The spelling of 72671387728 in words is "seventy-two billion, six hundred seventy-one million, three hundred eighty-seven thousand, seven hundred twenty-eight".