64721193 has 8 divisors (see below), whose sum is σ = 91371168. Its totient is φ = 40609344.

The previous prime is 64721191. The next prime is 64721207. The reversal of 64721193 is 39112746.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 64721193 - 2¹ = 64721191 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (64721191) 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, 634471 + ... + 634572.

It is an arithmetic number, because the mean of its divisors is an integer number (11421396).

Almost surely, 2^64721193 is an apocalyptic number.

It is an amenable number.

64721193 is a deficient number, since it is larger than the sum of its proper divisors (26649975).

64721193 is a wasteful number, since it uses less digits than its factorization.

64721193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1269063.

The product of its digits is 9072, while the sum is 33.

The square root of 64721193 is about 8044.9482906977. The cubic root of 64721193 is about 401.4968768286.

The spelling of 64721193 in words is "sixty-four million, seven hundred twenty-one thousand, one hundred ninety-three".