72343709985 has 64 divisors (see below), whose sum is σ = 124166246400. Its totient is φ = 35873798400.

The previous prime is 72343709983. The next prime is 72343709987. The reversal of 72343709985 is 58990734327.

It is an interprime number because it is at equal distance from previous prime (72343709983) and next prime (72343709987).

It is not a de Polignac number, because 72343709985 - 2¹ = 72343709983 is a prime.

It is a super-2 number, since 2×72343709985² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (72343709983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 17856210 + ... + 17860260.

It is an arithmetic number, because the mean of its divisors is an integer number (1940097600).

Almost surely, 2^72343709985 is an apocalyptic number.

72343709985 is the 155289-th octagonal number.

It is an amenable number.

72343709985 is a deficient number, since it is larger than the sum of its proper divisors (51822536415).

72343709985 is a wasteful number, since it uses less digits than its factorization.

72343709985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5518.

The product of its (nonzero) digits is 11430720, while the sum is 57.

The spelling of 72343709985 in words is "seventy-two billion, three hundred forty-three million, seven hundred nine thousand, nine hundred eighty-five".