667949637 has 8 divisors (see below), whose sum is σ = 890794336. Its totient is φ = 445202352.

The previous prime is 667949629. The next prime is 667949671. The reversal of 667949637 is 736949766.

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

It is not a de Polignac number, because 667949637 - 2³ = 667949629 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 (667949687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6478 + ... + 37119.

It is an arithmetic number, because the mean of its divisors is an integer number (111349292).

Almost surely, 2^667949637 is an apocalyptic number.

It is an amenable number.

667949637 is a deficient number, since it is larger than the sum of its proper divisors (222844699).

667949637 is a wasteful number, since it uses less digits than its factorization.

667949637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48707.

The product of its digits is 10287648, while the sum is 57.

The square root of 667949637 is about 25844.7216467889. The cubic root of 667949637 is about 874.1404945490.

The spelling of 667949637 in words is "six hundred sixty-seven million, nine hundred forty-nine thousand, six hundred thirty-seven".