72543881 has 8 divisors (see below), whose sum is σ = 78138720. Its totient is φ = 67126752.

The previous prime is 72543869. The next prime is 72543923. The reversal of 72543881 is 18834527.

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

It is a cyclic number.

It is not a de Polignac number, because 72543881 - 2¹⁰ = 72542857 is a prime.

It is a super-2 number, since 2×72543881² = 10525229341084322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72545881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43580 + ... + 45213.

It is an arithmetic number, because the mean of its divisors is an integer number (9767340).

Almost surely, 2^72543881 is an apocalyptic number.

It is an amenable number.

72543881 is a deficient number, since it is larger than the sum of its proper divisors (5594839).

72543881 is a wasteful number, since it uses less digits than its factorization.

72543881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88855.

The product of its digits is 53760, while the sum is 38.

The square root of 72543881 is about 8517.2695742239. The cubic root of 72543881 is about 417.0616547421.

The spelling of 72543881 in words is "seventy-two million, five hundred forty-three thousand, eight hundred eighty-one".