72235733646 has 16 divisors (see below), whose sum is σ = 144900170064. Its totient is φ = 24007127424.

The previous prime is 72235733639. The next prime is 72235733681. The reversal of 72235733646 is 64633753227.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 72235733595 and 72235733604.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 17860425 + ... + 17864468.

It is an arithmetic number, because the mean of its divisors is an integer number (9056260629).

Almost surely, 2^72235733646 is an apocalyptic number.

72235733646 is an abundant number, since it is smaller than the sum of its proper divisors (72664436418).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72235733646 is a wasteful number, since it uses less digits than its factorization.

72235733646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35725235.

The product of its digits is 3810240, while the sum is 48.

The spelling of 72235733646 in words is "seventy-two billion, two hundred thirty-five million, seven hundred thirty-three thousand, six hundred forty-six".