72530172881 has 8 divisors (see below), whose sum is σ = 73855895904. Its totient is φ = 71216447680.

The previous prime is 72530172859. The next prime is 72530172893. The reversal of 72530172881 is 18827103527.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72530172881 is a prime.

It is a super-2 number, since 2×72530172881² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72530175881) 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 7 ways as a sum of consecutive naturals, for example, 2987255 + ... + 3011436.

It is an arithmetic number, because the mean of its divisors is an integer number (9231986988).

Almost surely, 2^72530172881 is an apocalyptic number.

It is an amenable number.

72530172881 is a deficient number, since it is larger than the sum of its proper divisors (1325723023).

72530172881 is a wasteful number, since it uses less digits than its factorization.

72530172881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5998911.

The product of its (nonzero) digits is 188160, while the sum is 44.

The spelling of 72530172881 in words is "seventy-two billion, five hundred thirty million, one hundred seventy-two thousand, eight hundred eighty-one".