72171417 has 4 divisors (see below), whose sum is σ = 96228560. Its totient is φ = 48114276.

The previous prime is 72171413. The next prime is 72171457. The reversal of 72171417 is 71417127.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 72171417 - 2² = 72171413 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72171413) 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, 12028567 + ... + 12028572.

It is an arithmetic number, because the mean of its divisors is an integer number (24057140).

Almost surely, 2^72171417 is an apocalyptic number.

It is an amenable number.

72171417 is a deficient number, since it is larger than the sum of its proper divisors (24057143).

72171417 is a wasteful number, since it uses less digits than its factorization.

72171417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24057142.

The product of its digits is 2744, while the sum is 30.

The square root of 72171417 is about 8495.3762129761. The cubic root of 72171417 is about 416.3466526992.

The spelling of 72171417 in words is "seventy-two million, one hundred seventy-one thousand, four hundred seventeen".