64445971 has 8 divisors (see below), whose sum is σ = 66361680. Its totient is φ = 62539488.

The previous prime is 64445939. The next prime is 64445987. The reversal of 64445971 is 17954446.

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 64445971 - 2⁵ = 64445939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64445911) 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, 13425 + ... + 17581.

It is an arithmetic number, because the mean of its divisors is an integer number (8295210).

Almost surely, 2^64445971 is an apocalyptic number.

64445971 is a deficient number, since it is larger than the sum of its proper divisors (1915709).

64445971 is a wasteful number, since it uses less digits than its factorization.

64445971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4613.

The product of its digits is 120960, while the sum is 40.

The square root of 64445971 is about 8027.8247987858. The cubic root of 64445971 is about 400.9269564699.

The spelling of 64445971 in words is "sixty-four million, four hundred forty-five thousand, nine hundred seventy-one".