71945609 has 8 divisors (see below), whose sum is σ = 75828480. Its totient is φ = 68072400.

The previous prime is 71945569. The next prime is 71945639. The reversal of 71945609 is 90654917.

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 71945609 - 2²⁰ = 70897033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71945639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16919 + ... + 20739.

It is an arithmetic number, because the mean of its divisors is an integer number (9478560).

Almost surely, 2^71945609 is an apocalyptic number.

It is an amenable number.

71945609 is a deficient number, since it is larger than the sum of its proper divisors (3882871).

71945609 is a wasteful number, since it uses less digits than its factorization.

71945609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4831.

The product of its (nonzero) digits is 68040, while the sum is 41.

The square root of 71945609 is about 8482.0757483060. The cubic root of 71945609 is about 415.9119809618.

The spelling of 71945609 in words is "seventy-one million, nine hundred forty-five thousand, six hundred nine".