667789639 has 8 divisors (see below), whose sum is σ = 729780480. Its totient is φ = 606012600.

The previous prime is 667789627. The next prime is 667789651. The reversal of 667789639 is 936987766.

It is an interprime number because it is at equal distance from previous prime (667789627) and next prime (667789651).

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

It is a cyclic number.

It is not a de Polignac number, because 667789639 - 2⁷ = 667789511 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667789669) 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, 46879 + ... + 59440.

It is an arithmetic number, because the mean of its divisors is an integer number (91222560).

Almost surely, 2^667789639 is an apocalyptic number.

667789639 is a deficient number, since it is larger than the sum of its proper divisors (61990841).

667789639 is a wasteful number, since it uses less digits than its factorization.

667789639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106901.

The product of its digits is 20575296, while the sum is 61.

The square root of 667789639 is about 25841.6260904766. The cubic root of 667789639 is about 874.0706929293.

The spelling of 667789639 in words is "six hundred sixty-seven million, seven hundred eighty-nine thousand, six hundred thirty-nine".