64384921 has 8 divisors (see below), whose sum is σ = 66965120. Its totient is φ = 61849008.

The previous prime is 64384913. The next prime is 64384949. The reversal of 64384921 is 12948346.

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 64384921 - 2³ = 64384913 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64384421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8091 + ... + 13936.

It is an arithmetic number, because the mean of its divisors is an integer number (8370640).

Almost surely, 2^64384921 is an apocalyptic number.

It is an amenable number.

64384921 is a deficient number, since it is larger than the sum of its proper divisors (2580199).

64384921 is a wasteful number, since it uses less digits than its factorization.

64384921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22143.

The product of its digits is 41472, while the sum is 37.

The square root of 64384921 is about 8024.0214979772. The cubic root of 64384921 is about 400.8003164162.

The spelling of 64384921 in words is "sixty-four million, three hundred eighty-four thousand, nine hundred twenty-one".