72171705 has 8 divisors (see below), whose sum is σ = 115474752. Its totient is φ = 38491568.

The previous prime is 72171683. The next prime is 72171721. The reversal of 72171705 is 50717127.

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 72171705 - 2⁶ = 72171641 is a prime.

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, 2405709 + ... + 2405738.

It is an arithmetic number, because the mean of its divisors is an integer number (14434344).

Almost surely, 2^72171705 is an apocalyptic number.

It is an amenable number.

72171705 is a deficient number, since it is larger than the sum of its proper divisors (43303047).

72171705 is a wasteful number, since it uses less digits than its factorization.

72171705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4811455.

The product of its (nonzero) digits is 3430, while the sum is 30.

The square root of 72171705 is about 8495.3931633562. The cubic root of 72171705 is about 416.3472065089.

It can be divided in two parts, 7 and 2171705, that added together give a palindrome (2171712).

The spelling of 72171705 in words is "seventy-two million, one hundred seventy-one thousand, seven hundred five".