667945731 has 8 divisors (see below), whose sum is σ = 890723664. Its totient is φ = 445232480.

The previous prime is 667945727. The next prime is 667945739. The reversal of 667945731 is 137549766.

It is a happy number.

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 667945731 - 2² = 667945727 is a prime.

It is a super-3 number, since 3×667945731³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (667945739) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18625 + ... + 41021.

It is an arithmetic number, because the mean of its divisors is an integer number (111340458).

Almost surely, 2^667945731 is an apocalyptic number.

667945731 is a deficient number, since it is larger than the sum of its proper divisors (222777933).

667945731 is a wasteful number, since it uses less digits than its factorization.

667945731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32341.

The product of its digits is 952560, while the sum is 48.

The square root of 667945731 is about 25844.6460799911. The cubic root of 667945731 is about 874.1387906284.

The spelling of 667945731 in words is "six hundred sixty-seven million, nine hundred forty-five thousand, seven hundred thirty-one".