64847621 has 2 divisors, whose sum is σ = 64847622. Its totient is φ = 64847620.

The previous prime is 64847593. The next prime is 64847641. The reversal of 64847621 is 12674846.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47416996 + 17430625 = 6886^2 + 4175^2 .

It is a cyclic number.

It is not a de Polignac number, because 64847621 - 2²² = 60653317 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 (64847641) 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 as a sum of consecutive naturals, namely, 32423810 + 32423811.

It is an arithmetic number, because the mean of its divisors is an integer number (32423811).

Almost surely, 2^64847621 is an apocalyptic number.

It is an amenable number.

64847621 is a deficient number, since it is larger than the sum of its proper divisors (1).

64847621 is an equidigital number, since it uses as much as digits as its factorization.

64847621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64512, while the sum is 38.

The square root of 64847621 is about 8052.8020589109. The cubic root of 64847621 is about 401.7581381372.

The spelling of 64847621 in words is "sixty-four million, eight hundred forty-seven thousand, six hundred twenty-one".