72104789 has 4 divisors (see below), whose sum is σ = 72503340. Its totient is φ = 71706240.

The previous prime is 72104779. The next prime is 72104807. The reversal of 72104789 is 98740127.

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

It can be written as a sum of positive squares in 2 ways, for example, as 29789764 + 42315025 = 5458^2 + 6505^2 .

It is a cyclic number.

It is not a de Polignac number, because 72104789 - 2²⁰ = 71056213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72104719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 199004 + ... + 199365.

It is an arithmetic number, because the mean of its divisors is an integer number (18125835).

Almost surely, 2^72104789 is an apocalyptic number.

It is an amenable number.

72104789 is a deficient number, since it is larger than the sum of its proper divisors (398551).

72104789 is a wasteful number, since it uses less digits than its factorization.

72104789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398550.

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 72104789 is about 8491.4538802257. The cubic root of 72104789 is about 416.2184907627.

The spelling of 72104789 in words is "seventy-two million, one hundred four thousand, seven hundred eighty-nine".