72170147 has 4 divisors (see below), whose sum is σ = 82480176. Its totient is φ = 61860120.

The previous prime is 72170141. The next prime is 72170149. The reversal of 72170147 is 74107127.

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

It is not a de Polignac number, because 72170147 - 2¹² = 72166051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72170141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5155004 + ... + 5155017.

It is an arithmetic number, because the mean of its divisors is an integer number (20620044).

Almost surely, 2^72170147 is an apocalyptic number.

72170147 is a deficient number, since it is larger than the sum of its proper divisors (10310029).

72170147 is a wasteful number, since it uses less digits than its factorization.

72170147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10310028.

The product of its (nonzero) digits is 2744, while the sum is 29.

The square root of 72170147 is about 8495.3014661047. The cubic root of 72170147 is about 416.3442105351.

The spelling of 72170147 in words is "seventy-two million, one hundred seventy thousand, one hundred forty-seven".