667279787 has 8 divisors (see below), whose sum is σ = 676957920. Its totient is φ = 657616320.

The previous prime is 667279759. The next prime is 667279799. The reversal of 667279787 is 787972766.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667279787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667239787) 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 7 ways as a sum of consecutive naturals, for example, 115514 + ... + 121152.

It is an arithmetic number, because the mean of its divisors is an integer number (84619740).

Almost surely, 2^667279787 is an apocalyptic number.

667279787 is a deficient number, since it is larger than the sum of its proper divisors (9678133).

667279787 is a wasteful number, since it uses less digits than its factorization.

667279787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7333.

The product of its digits is 12446784, while the sum is 59.

The square root of 667279787 is about 25831.7592703246. The cubic root of 667279787 is about 873.8481876527.

The spelling of 667279787 in words is "six hundred sixty-seven million, two hundred seventy-nine thousand, seven hundred eighty-seven".