64507609 has 2 divisors, whose sum is σ = 64507610. Its totient is φ = 64507608.

The previous prime is 64507601. The next prime is 64507627. The reversal of 64507609 is 90670546.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34257609 + 30250000 = 5853^2 + 5500^2 .

It is a cyclic number.

It is not a de Polignac number, because 64507609 - 2³ = 64507601 is a prime.

It is a super-2 number, since 2×64507609² = 8322463237793762, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (64507601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32253804 + 32253805.

It is an arithmetic number, because the mean of its divisors is an integer number (32253805).

Almost surely, 2^64507609 is an apocalyptic number.

It is an amenable number.

64507609 is a deficient number, since it is larger than the sum of its proper divisors (1).

64507609 is an equidigital number, since it uses as much as digits as its factorization.

64507609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 64507609 is about 8031.6629037828. The cubic root of 64507609 is about 401.0547351400.

The spelling of 64507609 in words is "sixty-four million, five hundred seven thousand, six hundred nine".