667281887 has 4 divisors (see below), whose sum is σ = 667350000. Its totient is φ = 667213776.

The previous prime is 667281859. The next prime is 667281893. The reversal of 667281887 is 788182766.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667281887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667281827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16262 + ... + 39987.

It is an arithmetic number, because the mean of its divisors is an integer number (166837500).

Almost surely, 2^667281887 is an apocalyptic number.

667281887 is a deficient number, since it is larger than the sum of its proper divisors (68113).

667281887 is a wasteful number, since it uses less digits than its factorization.

667281887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68112.

The product of its digits is 1806336, while the sum is 53.

The square root of 667281887 is about 25831.7999179306. The cubic root of 667281887 is about 873.8491043493.

The spelling of 667281887 in words is "six hundred sixty-seven million, two hundred eighty-one thousand, eight hundred eighty-seven".