64384421 has 2 divisors, whose sum is σ = 64384422. Its totient is φ = 64384420.

The previous prime is 64384417. The next prime is 64384471. The reversal of 64384421 is 12448346.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56460196 + 7924225 = 7514^2 + 2815^2 .

It is a cyclic number.

It is not a de Polignac number, because 64384421 - 2² = 64384417 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64384471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32192210 + 32192211.

It is an arithmetic number, because the mean of its divisors is an integer number (32192211).

Almost surely, 2^64384421 is an apocalyptic number.

It is an amenable number.

64384421 is a deficient number, since it is larger than the sum of its proper divisors (1).

64384421 is an equidigital number, since it uses as much as digits as its factorization.

64384421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18432, while the sum is 32.

The square root of 64384421 is about 8023.9903414698. The cubic root of 64384421 is about 400.7992789026.

The spelling of 64384421 in words is "sixty-four million, three hundred eighty-four thousand, four hundred twenty-one".