72331821305 has 8 divisors (see below), whose sum is σ = 86802939144. Its totient is φ = 57862288000.

The previous prime is 72331821299. The next prime is 72331821403. The reversal of 72331821305 is 50312813327.

It can be written as a sum of positive squares in 4 ways, for example, as 4576251904 + 67755569401 = 67648^2 + 260299^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 72331821305 - 2⁶ = 72331821241 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 293276 + ... + 480285.

It is an arithmetic number, because the mean of its divisors is an integer number (10850367393).

Almost surely, 2^72331821305 is an apocalyptic number.

It is an amenable number.

72331821305 is a deficient number, since it is larger than the sum of its proper divisors (14471117839).

72331821305 is a wasteful number, since it uses less digits than its factorization.

72331821305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 792267.

The product of its (nonzero) digits is 30240, while the sum is 35.

The spelling of 72331821305 in words is "seventy-two billion, three hundred thirty-one million, eight hundred twenty-one thousand, three hundred five".