72106172 has 6 divisors (see below), whose sum is σ = 126185808. Its totient is φ = 36053084.

The previous prime is 72106171. The next prime is 72106241. The reversal of 72106172 is 27160127.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72106171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9013268 + ... + 9013275.

It is an arithmetic number, because the mean of its divisors is an integer number (21030968).

Almost surely, 2^72106172 is an apocalyptic number.

It is an amenable number.

72106172 is a deficient number, since it is larger than the sum of its proper divisors (54079636).

72106172 is a wasteful number, since it uses less digits than its factorization.

72106172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18026547 (or 18026545 counting only the distinct ones).

The product of its (nonzero) digits is 1176, while the sum is 26.

The square root of 72106172 is about 8491.5353146531. The cubic root of 72106172 is about 416.2211518272.

Adding to 72106172 its reverse (27160127), we get a palindrome (99266299).

The spelling of 72106172 in words is "seventy-two million, one hundred six thousand, one hundred seventy-two".