72767601905 has 4 divisors (see below), whose sum is σ = 87321122292. Its totient is φ = 58214081520.

The previous prime is 72767601901. The next prime is 72767601943. The reversal of 72767601905 is 50910676727.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50910676727 = 76421 ⋅666187.

It can be written as a sum of positive squares in 2 ways, for example, as 8463264016 + 64304337889 = 91996^2 + 253583^2 .

It is not a de Polignac number, because 72767601905 - 2² = 72767601901 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72767601901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7276760186 + ... + 7276760195.

It is an arithmetic number, because the mean of its divisors is an integer number (21830280573).

Almost surely, 2^72767601905 is an apocalyptic number.

It is an amenable number.

72767601905 is a deficient number, since it is larger than the sum of its proper divisors (14553520387).

72767601905 is a wasteful number, since it uses less digits than its factorization.

72767601905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14553520386.

The product of its (nonzero) digits is 1111320, while the sum is 50.

The spelling of 72767601905 in words is "seventy-two billion, seven hundred sixty-seven million, six hundred one thousand, nine hundred five".