72639371109 has 16 divisors (see below), whose sum is σ = 98054989632. Its totient is φ = 47828030208.

The previous prime is 72639371099. The next prime is 72639371117. The reversal of 72639371109 is 90117393627.

It is a happy number.

It is not a de Polignac number, because 72639371109 - 2⁴ = 72639371093 is a prime.

It is a super-2 number, since 2×72639371109² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72639371159) 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 15 ways as a sum of consecutive naturals, for example, 282642 + ... + 474515.

It is an arithmetic number, because the mean of its divisors is an integer number (6128436852).

Almost surely, 2^72639371109 is an apocalyptic number.

It is an amenable number.

72639371109 is a deficient number, since it is larger than the sum of its proper divisors (25415618523).

72639371109 is a wasteful number, since it uses less digits than its factorization.

72639371109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 757556.

The product of its (nonzero) digits is 428652, while the sum is 48.

The spelling of 72639371109 in words is "seventy-two billion, six hundred thirty-nine million, three hundred seventy-one thousand, one hundred nine".