72049865939 has 4 divisors (see below), whose sum is σ = 72427090560. Its totient is φ = 71672641320.

The previous prime is 72049865917. The next prime is 72049865959. The reversal of 72049865939 is 93956894027.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 72049865939 - 2²⁰ = 72048817363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72049865959) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 188612024 + ... + 188612405.

It is an arithmetic number, because the mean of its divisors is an integer number (18106772640).

Almost surely, 2^72049865939 is an apocalyptic number.

72049865939 is a deficient number, since it is larger than the sum of its proper divisors (377224621).

72049865939 is a wasteful number, since it uses less digits than its factorization.

72049865939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377224620.

The product of its (nonzero) digits is 29393280, while the sum is 62.

The spelling of 72049865939 in words is "seventy-two billion, forty-nine million, eight hundred sixty-five thousand, nine hundred thirty-nine".