64721295 has 32 divisors (see below), whose sum is σ = 121832640. Its totient is φ = 32486400.

The previous prime is 64721291. The next prime is 64721309. The reversal of 64721295 is 59212746.

64721295 is a `hidden beast` number, since 647 + 2 + 1 + 2 + 9 + 5 = 666.

It is not a de Polignac number, because 64721295 - 2² = 64721291 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64721291) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11806 + ... + 16395.

It is an arithmetic number, because the mean of its divisors is an integer number (3807270).

Almost surely, 2^64721295 is an apocalyptic number.

64721295 is a deficient number, since it is larger than the sum of its proper divisors (57111345).

64721295 is a wasteful number, since it uses less digits than its factorization.

64721295 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28232 (or 28226 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 64721295 is about 8044.9546300772. The cubic root of 64721295 is about 401.4970877470.

The spelling of 64721295 in words is "sixty-four million, seven hundred twenty-one thousand, two hundred ninety-five".