667455987 has 32 divisors (see below), whose sum is σ = 999800064. Its totient is φ = 392515200.

The previous prime is 667455973. The next prime is 667455991. The reversal of 667455987 is 789554766.

It is a de Polignac number, because none of the positive numbers 2^k-667455987 is a prime.

It is not an unprimeable number, because it can be changed into a prime (667455587) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 806668 + ... + 807494.

It is an arithmetic number, because the mean of its divisors is an integer number (31243752).

Almost surely, 2^667455987 is an apocalyptic number.

667455987 is a deficient number, since it is larger than the sum of its proper divisors (332344077).

667455987 is a wasteful number, since it uses less digits than its factorization.

667455987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1539.

The product of its digits is 12700800, while the sum is 57.

The square root of 667455987 is about 25835.1695755998. The cubic root of 667455987 is about 873.9250961716.

It can be divided in two parts, 667 and 455987, that added together give a palindrome (456654).

The spelling of 667455987 in words is "six hundred sixty-seven million, four hundred fifty-five thousand, nine hundred eighty-seven".