64804609 has 2 divisors, whose sum is σ = 64804610. Its totient is φ = 64804608.

The previous prime is 64804543. The next prime is 64804643. The reversal of 64804609 is 90640846.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64000000 + 804609 = 8000^2 + 897^2 .

It is a cyclic number.

It is not a de Polignac number, because 64804609 - 2¹¹ = 64802561 is a prime.

It is not a weakly prime, because it can be changed into another prime (64804669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32402304 + 32402305.

It is an arithmetic number, because the mean of its divisors is an integer number (32402305).

Almost surely, 2^64804609 is an apocalyptic number.

It is an amenable number.

64804609 is a deficient number, since it is larger than the sum of its proper divisors (1).

64804609 is an equidigital number, since it uses as much as digits as its factorization.

64804609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 64804609 is about 8050.1309927230. The cubic root of 64804609 is about 401.6692927139.

It can be divided in two parts, 64 and 804609, that multiplied together give a square (51494976 = 7176²).

The spelling of 64804609 in words is "sixty-four million, eight hundred four thousand, six hundred nine".