64173969 has 6 divisors (see below), whose sum is σ = 92695746. Its totient is φ = 42782640.

The previous prime is 64173959. The next prime is 64173971. The reversal of 64173969 is 96937146.

It can be written as a sum of positive squares in only one way, i.e., 53363025 + 10810944 = 7305^2 + 3288^2 .

It is not a de Polignac number, because 64173969 - 2⁸ = 64173713 is a prime.

It is a super-2 number, since 2×64173969² = 8236596594425922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64173959) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3565212 + ... + 3565229.

It is an arithmetic number, because the mean of its divisors is an integer number (15449291).

Almost surely, 2^64173969 is an apocalyptic number.

It is an amenable number.

64173969 is a deficient number, since it is larger than the sum of its proper divisors (28521777).

64173969 is a wasteful number, since it uses less digits than its factorization.

64173969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7130447 (or 7130444 counting only the distinct ones).

The product of its digits is 244944, while the sum is 45.

The square root of 64173969 is about 8010.8656835576. The cubic root of 64173969 is about 400.3621075131.

The spelling of 64173969 in words is "sixty-four million, one hundred seventy-three thousand, nine hundred sixty-nine".