667346740 has 24 divisors (see below), whose sum is σ = 1402327080. Its totient is φ = 266767488.

The previous prime is 667346737. The next prime is 667346761. The reversal of 667346740 is 47643766.

It can be written as a sum of positive squares in 4 ways, for example, as 46539684 + 620807056 = 6822^2 + 24916^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24006 + ... + 43714.

It is an arithmetic number, because the mean of its divisors is an integer number (58430295).

Almost surely, 2^667346740 is an apocalyptic number.

It is an amenable number.

667346740 is an abundant number, since it is smaller than the sum of its proper divisors (734980340).

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

667346740 is a wasteful number, since it uses less digits than its factorization.

667346740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21411 (or 21409 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 43.

The square root of 667346740 is about 25833.0551812982. The cubic root of 667346740 is about 873.8774131751.

The spelling of 667346740 in words is "six hundred sixty-seven million, three hundred forty-six thousand, seven hundred forty".