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6667889 is a prime number
BaseRepresentation
bin11001011011111001110001
3110112202121212
4121123321301
53201333024
6354525505
7110450624
oct31337161
913482555
106667889
113844758
122296895
1314c5cc7
14c57dbb
158baa0e
hex65be71

6667889 has 2 divisors, whose sum is σ = 6667890. Its totient is φ = 6667888.

The previous prime is 6667873. The next prime is 6667891. The reversal of 6667889 is 9887666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6589489 + 78400 = 2567^2 + 280^2 .

It is a cyclic number.

It is not a de Polignac number, because 6667889 - 24 = 6667873 is a prime.

It is a Sophie Germain prime.

Together with 6667891, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a plaindrome in base 10.

It is not a weakly prime, because it can be changed into another prime (6667819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3333944 + 3333945.

It is an arithmetic number, because the mean of its divisors is an integer number (3333945).

Almost surely, 26667889 is an apocalyptic number.

It is an amenable number.

6667889 is a deficient number, since it is larger than the sum of its proper divisors (1).

6667889 is an equidigital number, since it uses as much as digits as its factorization.

6667889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 50.

The square root of 6667889 is about 2582.2255904549. The cubic root of 6667889 is about 188.2187076703.

The spelling of 6667889 in words is "six million, six hundred sixty-seven thousand, eight hundred eighty-nine".