667705478 has 32 divisors (see below), whose sum is σ = 1141240320. Its totient is φ = 290273760.

The previous prime is 667705477. The next prime is 667705517. The reversal of 667705478 is 874507766.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667705471) 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, 41075 + ... + 54977.

It is an arithmetic number, because the mean of its divisors is an integer number (35663760).

Almost surely, 2^667705478 is an apocalyptic number.

667705478 is a deficient number, since it is larger than the sum of its proper divisors (473534842).

667705478 is a wasteful number, since it uses less digits than its factorization.

667705478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14012.

The product of its (nonzero) digits is 1975680, while the sum is 50.

The square root of 667705478 is about 25839.9976393188. The cubic root of 667705478 is about 874.0339719073.

The spelling of 667705478 in words is "six hundred sixty-seven million, seven hundred five thousand, four hundred seventy-eight".