667281889 has 4 divisors (see below), whose sum is σ = 681479424. Its totient is φ = 653084356.

The previous prime is 667281859. The next prime is 667281893. The reversal of 667281889 is 988182766.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 667281889 - 2⁷ = 667281761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667281809) 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 in 3 ways as a sum of consecutive naturals, for example, 7098697 + ... + 7098790.

It is an arithmetic number, because the mean of its divisors is an integer number (170369856).

Almost surely, 2^667281889 is an apocalyptic number.

It is an amenable number.

667281889 is a deficient number, since it is larger than the sum of its proper divisors (14197535).

667281889 is a wasteful number, since it uses less digits than its factorization.

667281889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14197534.

The product of its digits is 2322432, while the sum is 55.

The square root of 667281889 is about 25831.7999566426. The cubic root of 667281889 is about 873.8491052224.

The spelling of 667281889 in words is "six hundred sixty-seven million, two hundred eighty-one thousand, eight hundred eighty-nine".