669828889 has 2 divisors, whose sum is σ = 669828890. Its totient is φ = 669828888.

The previous prime is 669828877. The next prime is 669828899. The reversal of 669828889 is 988828966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 392040000 + 277788889 = 19800^2 + 16667^2 .

It is a cyclic number.

It is not a de Polignac number, because 669828889 - 2¹⁵ = 669796121 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 669828889.

It is not a weakly prime, because it can be changed into another prime (669828899) 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, 334914444 + 334914445.

It is an arithmetic number, because the mean of its divisors is an integer number (334914445).

Almost surely, 2^669828889 is an apocalyptic number.

It is an amenable number.

669828889 is a deficient number, since it is larger than the sum of its proper divisors (1).

669828889 is an equidigital number, since it uses as much as digits as its factorization.

669828889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23887872, while the sum is 64.

The square root of 669828889 is about 25881.0527027013. The cubic root of 669828889 is about 874.9595144261.

The spelling of 669828889 in words is "six hundred sixty-nine million, eight hundred twenty-eight thousand, eight hundred eighty-nine".