64672609 has 2 divisors, whose sum is σ = 64672610. Its totient is φ = 64672608.

The previous prime is 64672589. The next prime is 64672661. The reversal of 64672609 is 90627646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59721984 + 4950625 = 7728^2 + 2225^2 .

It is a cyclic number.

It is not a de Polignac number, because 64672609 - 2¹³ = 64664417 is a prime.

It is not a weakly prime, because it can be changed into another prime (64672679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32336304 + 32336305.

It is an arithmetic number, because the mean of its divisors is an integer number (32336305).

Almost surely, 2^64672609 is an apocalyptic number.

It is an amenable number.

64672609 is a deficient number, since it is larger than the sum of its proper divisors (1).

64672609 is an equidigital number, since it uses as much as digits as its factorization.

64672609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 64672609 is about 8041.9281891845. The cubic root of 64672609 is about 401.3963883266.

The spelling of 64672609 in words is "sixty-four million, six hundred seventy-two thousand, six hundred nine".