71672417 has 4 divisors (see below), whose sum is σ = 71951556. Its totient is φ = 71393280.

The previous prime is 71672413. The next prime is 71672449. The reversal of 71672417 is 71427617.

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

It can be written as a sum of positive squares in 2 ways, for example, as 59845696 + 11826721 = 7736^2 + 3439^2 .

It is a cyclic number.

It is not a de Polignac number, because 71672417 - 2² = 71672413 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71672411) 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, 139184 + ... + 139697.

It is an arithmetic number, because the mean of its divisors is an integer number (17987889).

Almost surely, 2^71672417 is an apocalyptic number.

It is an amenable number.

71672417 is a deficient number, since it is larger than the sum of its proper divisors (279139).

71672417 is a wasteful number, since it uses less digits than its factorization.

71672417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279138.

The product of its digits is 16464, while the sum is 35.

The square root of 71672417 is about 8465.9563547186. The cubic root of 71672417 is about 415.3848793120.

The spelling of 71672417 in words is "seventy-one million, six hundred seventy-two thousand, four hundred seventeen".