72640516838 has 16 divisors (see below), whose sum is σ = 110059232976. Its totient is φ = 35954234400.

The previous prime is 72640516831. The next prime is 72640516867. The reversal of 72640516838 is 83861504627.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72640516831) 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 7 ways as a sum of consecutive naturals, for example, 1224020 + ... + 1281992.

It is an arithmetic number, because the mean of its divisors is an integer number (6878702061).

Almost surely, 2^72640516838 is an apocalyptic number.

72640516838 is a deficient number, since it is larger than the sum of its proper divisors (37418716138).

72640516838 is a wasteful number, since it uses less digits than its factorization.

72640516838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64279.

The product of its (nonzero) digits is 1935360, while the sum is 50.

The spelling of 72640516838 in words is "seventy-two billion, six hundred forty million, five hundred sixteen thousand, eight hundred thirty-eight".