667672431 has 8 divisors (see below), whose sum is σ = 891431040. Its totient is φ = 444514392.

The previous prime is 667672373. The next prime is 667672469. The reversal of 667672431 is 134276766.

It is a happy number.

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

It is not a de Polignac number, because 667672431 - 2⁶ = 667672367 is a prime.

It is a super-2 number, since 2×667672431² = 891572950234899522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667673431) 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, 147541 + ... + 151998.

It is an arithmetic number, because the mean of its divisors is an integer number (111428880).

Almost surely, 2^667672431 is an apocalyptic number.

667672431 is a deficient number, since it is larger than the sum of its proper divisors (223758609).

667672431 is a wasteful number, since it uses less digits than its factorization.

667672431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300285.

The product of its digits is 254016, while the sum is 42.

The square root of 667672431 is about 25839.3581770136. The cubic root of 667672431 is about 874.0195520380.

The spelling of 667672431 in words is "six hundred sixty-seven million, six hundred seventy-two thousand, four hundred thirty-one".