667365128 has 8 divisors (see below), whose sum is σ = 1251309630. Its totient is φ = 333682560.

The previous prime is 667365109. The next prime is 667365137. The reversal of 667365128 is 821563766.

667365128 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 528172324 + 139192804 = 22982^2 + 11798^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-3 number, since 3×667365128³ (a number of 27 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41710313 + ... + 41710328.

Almost surely, 2^667365128 is an apocalyptic number.

It is an amenable number.

667365128 is a deficient number, since it is larger than the sum of its proper divisors (583944502).

667365128 is a wasteful number, since it uses less digits than its factorization.

667365128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83420647 (or 83420643 counting only the distinct ones).

The product of its digits is 362880, while the sum is 44.

The square root of 667365128 is about 25833.4110794529. The cubic root of 667365128 is about 873.8854393427.

The spelling of 667365128 in words is "six hundred sixty-seven million, three hundred sixty-five thousand, one hundred twenty-eight".