72120311233 has 4 divisors (see below), whose sum is σ = 76362682500. Its totient is φ = 67877939968.

The previous prime is 72120311231. The next prime is 72120311281. The reversal of 72120311233 is 33211302127.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 28235089089 + 43885222144 = 168033^2 + 209488^2 .

It is a cyclic number.

It is not a de Polignac number, because 72120311233 - 2¹ = 72120311231 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 72120311198 and 72120311207.

It is not an unprimeable number, because it can be changed into a prime (72120311231) 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 3 ways as a sum of consecutive naturals, for example, 2121185608 + ... + 2121185641.

It is an arithmetic number, because the mean of its divisors is an integer number (19090670625).

Almost surely, 2^72120311233 is an apocalyptic number.

It is an amenable number.

72120311233 is a deficient number, since it is larger than the sum of its proper divisors (4242371267).

72120311233 is a wasteful number, since it uses less digits than its factorization.

72120311233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4242371266.

The product of its (nonzero) digits is 1512, while the sum is 25.

The spelling of 72120311233 in words is "seventy-two billion, one hundred twenty million, three hundred eleven thousand, two hundred thirty-three".