64963609 has 2 divisors, whose sum is σ = 64963610. Its totient is φ = 64963608.

The previous prime is 64963589. The next prime is 64963643. The reversal of 64963609 is 90636946.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64963600 + 9 = 8060^2 + 3^2 .

It is a cyclic number.

It is not a de Polignac number, because 64963609 - 2¹³ = 64955417 is a prime.

It is not a weakly prime, because it can be changed into another prime (64963699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32481804 + 32481805.

It is an arithmetic number, because the mean of its divisors is an integer number (32481805).

Almost surely, 2^64963609 is an apocalyptic number.

It is an amenable number.

64963609 is a deficient number, since it is larger than the sum of its proper divisors (1).

64963609 is an equidigital number, since it uses as much as digits as its factorization.

64963609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 209952, while the sum is 43.

The square root of 64963609 is about 8060.0005583126. Note that the first 3 decimals coincide. The cubic root of 64963609 is about 401.9975268612.

It can be divided in two parts, 649 and 63609, that multiplied together give a triangular number (41282241 = T₉₀₈₆).

The spelling of 64963609 in words is "sixty-four million, nine hundred sixty-three thousand, six hundred nine".