72881671 has 4 divisors (see below), whose sum is σ = 73413792. Its totient is φ = 72349552.

The previous prime is 72881647. The next prime is 72881681. The reversal of 72881671 is 17618827.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72881671 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72881621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 265855 + ... + 266128.

It is an arithmetic number, because the mean of its divisors is an integer number (18353448).

Almost surely, 2^72881671 is an apocalyptic number.

72881671 is a deficient number, since it is larger than the sum of its proper divisors (532121).

72881671 is a wasteful number, since it uses less digits than its factorization.

72881671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532120.

The product of its digits is 37632, while the sum is 40.

The square root of 72881671 is about 8537.0762559555. The cubic root of 72881671 is about 417.7079815219.

The spelling of 72881671 in words is "seventy-two million, eight hundred eighty-one thousand, six hundred seventy-one".