64363921 has 8 divisors (see below), whose sum is σ = 68324040. Its totient is φ = 60423168.

The previous prime is 64363903. The next prime is 64363931. The reversal of 64363921 is 12936346.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 15713296 + 48650625 = 3964^2 + 6975^2 .

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

It is not a de Polignac number, because 64363921 - 2¹³ = 64355729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64363931) 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, 2325 + ... + 11581.

It is an arithmetic number, because the mean of its divisors is an integer number (8540505).

Almost surely, 2^64363921 is an apocalyptic number.

It is an amenable number.

64363921 is a deficient number, since it is larger than the sum of its proper divisors (3960119).

64363921 is a wasteful number, since it uses less digits than its factorization.

64363921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9683.

The product of its digits is 23328, while the sum is 34.

The square root of 64363921 is about 8022.7128204866. The cubic root of 64363921 is about 400.7567362229.

The spelling of 64363921 in words is "sixty-four million, three hundred sixty-three thousand, nine hundred twenty-one".