72539934787 has 4 divisors (see below), whose sum is σ = 72654895696. Its totient is φ = 72424973880.

The previous prime is 72539934751. The next prime is 72539934809. The reversal of 72539934787 is 78743993527.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72539934787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72539934287) 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 3 ways as a sum of consecutive naturals, for example, 57479508 + ... + 57480769.

It is an arithmetic number, because the mean of its divisors is an integer number (18163723924).

Almost surely, 2^72539934787 is an apocalyptic number.

72539934787 is a deficient number, since it is larger than the sum of its proper divisors (114960909).

72539934787 is a wasteful number, since it uses less digits than its factorization.

72539934787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114960908.

The product of its digits is 80015040, while the sum is 64.

The spelling of 72539934787 in words is "seventy-two billion, five hundred thirty-nine million, nine hundred thirty-four thousand, seven hundred eighty-seven".