64783009 has 2 divisors, whose sum is σ = 64783010. Its totient is φ = 64783008.

The previous prime is 64783007. The next prime is 64783021. The reversal of 64783009 is 90038746.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41886784 + 22896225 = 6472^2 + 4785^2 .

It is a cyclic number.

It is not a de Polignac number, because 64783009 - 2¹ = 64783007 is a prime.

Together with 64783007, it forms a pair of twin primes.

It is equal to p_3828475 and since 64783009 and 3828475 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (64783007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32391504 + 32391505.

It is an arithmetic number, because the mean of its divisors is an integer number (32391505).

Almost surely, 2^64783009 is an apocalyptic number.

It is an amenable number.

64783009 is a deficient number, since it is larger than the sum of its proper divisors (1).

64783009 is an equidigital number, since it uses as much as digits as its factorization.

64783009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 64783009 is about 8048.7892878370. The cubic root of 64783009 is about 401.6246610075.

The spelling of 64783009 in words is "sixty-four million, seven hundred eighty-three thousand, nine".