64208621 has 2 divisors, whose sum is σ = 64208622. Its totient is φ = 64208620.

The previous prime is 64208603. The next prime is 64208633. The reversal of 64208621 is 12680246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60918025 + 3290596 = 7805^2 + 1814^2 .

It is a cyclic number.

It is not a de Polignac number, because 64208621 - 2¹⁴ = 64192237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64208681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32104310 + 32104311.

It is an arithmetic number, because the mean of its divisors is an integer number (32104311).

Almost surely, 2^64208621 is an apocalyptic number.

It is an amenable number.

64208621 is a deficient number, since it is larger than the sum of its proper divisors (1).

64208621 is an equidigital number, since it uses as much as digits as its factorization.

64208621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 64208621 is about 8013.0282041186. The cubic root of 64208621 is about 400.4341556849.

Adding to 64208621 its reverse (12680246), we get a palindrome (76888867).

The spelling of 64208621 in words is "sixty-four million, two hundred eight thousand, six hundred twenty-one".