72839375779 has 4 divisors (see below), whose sum is σ = 73328230800. Its totient is φ = 72350520760.

The previous prime is 72839375759. The next prime is 72839375789. The reversal of 72839375779 is 97757393827.

It is a happy number.

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-72839375779 is a prime.

It is a Smith number, since the sum of its digits (67) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72839375759) 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, 244427287 + ... + 244427584.

It is an arithmetic number, because the mean of its divisors is an integer number (18332057700).

Almost surely, 2^72839375779 is an apocalyptic number.

72839375779 is a deficient number, since it is larger than the sum of its proper divisors (488855021).

72839375779 is a wasteful number, since it uses less digits than its factorization.

72839375779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488855020.

The product of its digits is 140026320, while the sum is 67.

The spelling of 72839375779 in words is "seventy-two billion, eight hundred thirty-nine million, three hundred seventy-five thousand, seven hundred seventy-nine".