667443738 has 32 divisors (see below), whose sum is σ = 1446754176. Its totient is φ = 204055488.

The previous prime is 667443737. The next prime is 667443781. The reversal of 667443738 is 837344766.

It is a super-2 number, since 2×667443738² = 890962286790825288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (667443731) 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 15 ways as a sum of consecutive naturals, for example, 15006 + ... + 39497.

It is an arithmetic number, because the mean of its divisors is an integer number (45211068).

Almost surely, 2^667443738 is an apocalyptic number.

667443738 is an abundant number, since it is smaller than the sum of its proper divisors (779310438).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

667443738 is a wasteful number, since it uses less digits than its factorization.

667443738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54678.

The product of its digits is 2032128, while the sum is 48.

The square root of 667443738 is about 25834.9325139432. The cubic root of 667443738 is about 873.9197501142.

The spelling of 667443738 in words is "six hundred sixty-seven million, four hundred forty-three thousand, seven hundred thirty-eight".