72109207 has 4 divisors (see below), whose sum is σ = 72143896. Its totient is φ = 72074520.

The previous prime is 72109187. The next prime is 72109217. The reversal of 72109207 is 70290127.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70290127 = 83 ⋅846869.

It is a cyclic number.

It is not a de Polignac number, because 72109207 - 2¹¹ = 72107159 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 (72109217) 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, 14013 + ... + 18454.

It is an arithmetic number, because the mean of its divisors is an integer number (18035974).

Almost surely, 2^72109207 is an apocalyptic number.

72109207 is a deficient number, since it is larger than the sum of its proper divisors (34689).

72109207 is a wasteful number, since it uses less digits than its factorization.

72109207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34688.

The product of its (nonzero) digits is 1764, while the sum is 28.

The square root of 72109207 is about 8491.7140201493. The cubic root of 72109207 is about 416.2269914266.

The spelling of 72109207 in words is "seventy-two million, one hundred nine thousand, two hundred seven".