72871973 has 4 divisors (see below), whose sum is σ = 76707360. Its totient is φ = 69036588.

The previous prime is 72871961. The next prime is 72871987. The reversal of 72871973 is 37917827.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72871973 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72871913) 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 3 ways as a sum of consecutive naturals, for example, 1917665 + ... + 1917702.

It is an arithmetic number, because the mean of its divisors is an integer number (19176840).

Almost surely, 2^72871973 is an apocalyptic number.

It is an amenable number.

72871973 is a deficient number, since it is larger than the sum of its proper divisors (3835387).

72871973 is a wasteful number, since it uses less digits than its factorization.

72871973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3835386.

The product of its digits is 148176, while the sum is 44.

The square root of 72871973 is about 8536.5082440070. The cubic root of 72871973 is about 417.6894532617.

The spelling of 72871973 in words is "seventy-two million, eight hundred seventy-one thousand, nine hundred seventy-three".