667734138 has 32 divisors (see below), whose sum is σ = 1561953600. Its totient is φ = 210863088.

The previous prime is 667734131. The next prime is 667734161. The reversal of 667734138 is 831437766.

It is a junction number, because it is equal to n+sod(n) for n = 667734093 and 667734102.

It is not an unprimeable number, because it can be changed into a prime (667734131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 324381 + ... + 326432.

It is an arithmetic number, because the mean of its divisors is an integer number (48811050).

Almost surely, 2^667734138 is an apocalyptic number.

667734138 is an abundant number, since it is smaller than the sum of its proper divisors (894219462).

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

667734138 is a wasteful number, since it uses less digits than its factorization.

667734138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650843 (or 650837 counting only the distinct ones).

The product of its digits is 508032, while the sum is 45.

The square root of 667734138 is about 25840.5521999821. The cubic root of 667734138 is about 874.0464771490.

The spelling of 667734138 in words is "six hundred sixty-seven million, seven hundred thirty-four thousand, one hundred thirty-eight".