764666489 has 2 divisors, whose sum is σ = 764666490. Its totient is φ = 764666488.

The previous prime is 764666437. The next prime is 764666509. The reversal of 764666489 is 984666467.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 392832400 + 371834089 = 19820^2 + 19283^2 .

It is a cyclic number.

It is not a de Polignac number, because 764666489 - 2⁸ = 764666233 is a prime.

It is not a weakly prime, because it can be changed into another prime (764666689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 382333244 + 382333245.

It is an arithmetic number, because the mean of its divisors is an integer number (382333245).

Almost surely, 2^764666489 is an apocalyptic number.

It is an amenable number.

764666489 is a deficient number, since it is larger than the sum of its proper divisors (1).

764666489 is an equidigital number, since it uses as much as digits as its factorization.

764666489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10450944, while the sum is 56.

The square root of 764666489 is about 27652.6036567988. The cubic root of 764666489 is about 914.4445010289. Note that the first 3 decimals are identical.

The spelling of 764666489 in words is "seven hundred sixty-four million, six hundred sixty-six thousand, four hundred eighty-nine".