72478440329 has 4 divisors (see below), whose sum is σ = 72734548176. Its totient is φ = 72222332484.

The previous prime is 72478440323. The next prime is 72478440337. The reversal of 72478440329 is 92304487427.

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-72478440329 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (72478440323) 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, 128053499 + ... + 128054064.

It is an arithmetic number, because the mean of its divisors is an integer number (18183637044).

Almost surely, 2^72478440329 is an apocalyptic number.

It is an amenable number.

72478440329 is a deficient number, since it is larger than the sum of its proper divisors (256107847).

72478440329 is a wasteful number, since it uses less digits than its factorization.

72478440329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256107846.

The product of its (nonzero) digits is 2709504, while the sum is 50.

The spelling of 72478440329 in words is "seventy-two billion, four hundred seventy-eight million, four hundred forty thousand, three hundred twenty-nine".