72105206 has 4 divisors (see below), whose sum is σ = 108157812. Its totient is φ = 36052602.

The previous prime is 72105203. The next prime is 72105217. The reversal of 72105206 is 60250127.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72105203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18026300 + ... + 18026303.

It is an arithmetic number, because the mean of its divisors is an integer number (27039453).

Almost surely, 2^72105206 is an apocalyptic number.

72105206 is a deficient number, since it is larger than the sum of its proper divisors (36052606).

72105206 is a wasteful number, since it uses less digits than its factorization.

72105206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36052605.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 72105206 is about 8491.4784342893. The cubic root of 72105206 is about 416.2192931263.

The spelling of 72105206 in words is "seventy-two million, one hundred five thousand, two hundred six".