72109205 has 8 divisors (see below), whose sum is σ = 98892672. Its totient is φ = 49446288.

The previous prime is 72109187. The next prime is 72109217. The reversal of 72109205 is 50290127.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72109205 - 2¹⁶ = 72043669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1030097 + ... + 1030166.

It is an arithmetic number, because the mean of its divisors is an integer number (12361584).

Almost surely, 2^72109205 is an apocalyptic number.

It is an amenable number.

72109205 is a deficient number, since it is larger than the sum of its proper divisors (26783467).

72109205 is a wasteful number, since it uses less digits than its factorization.

72109205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2060275.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 72109205 is about 8491.7139023874. The cubic root of 72109205 is about 416.2269875785.

The spelling of 72109205 in words is "seventy-two million, one hundred nine thousand, two hundred five".