72713869921 has 24 divisors (see below), whose sum is σ = 92485609920. Its totient is φ = 56530908000.

The previous prime is 72713869903. The next prime is 72713869927. The reversal of 72713869921 is 12996831727.

It is a happy number.

It is not a de Polignac number, because 72713869921 - 2¹¹ = 72713867873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72713869927) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 82971 + ... + 390271.

It is an arithmetic number, because the mean of its divisors is an integer number (3853567080).

Almost surely, 2^72713869921 is an apocalyptic number.

It is an amenable number.

72713869921 is a deficient number, since it is larger than the sum of its proper divisors (19771739999).

72713869921 is a wasteful number, since it uses less digits than its factorization.

72713869921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307765 (or 307758 counting only the distinct ones).

The product of its digits is 2286144, while the sum is 55.

The spelling of 72713869921 in words is "seventy-two billion, seven hundred thirteen million, eight hundred sixty-nine thousand, nine hundred twenty-one".