64812809 has 2 divisors, whose sum is σ = 64812810. Its totient is φ = 64812808.

The previous prime is 64812793. The next prime is 64812829. The reversal of 64812809 is 90821846.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40998409 + 23814400 = 6403^2 + 4880^2 .

It is a cyclic number.

It is not a de Polignac number, because 64812809 - 2⁴ = 64812793 is a prime.

It is not a weakly prime, because it can be changed into another prime (64812829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32406404 + 32406405.

It is an arithmetic number, because the mean of its divisors is an integer number (32406405).

Almost surely, 2^64812809 is an apocalyptic number.

It is an amenable number.

64812809 is a deficient number, since it is larger than the sum of its proper divisors (1).

64812809 is an equidigital number, since it uses as much as digits as its factorization.

64812809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 64812809 is about 8050.6402850953. The cubic root of 64812809 is about 401.6862336349.

The spelling of 64812809 in words is "sixty-four million, eight hundred twelve thousand, eight hundred nine".