667728130 has 8 divisors (see below), whose sum is σ = 1201910652. Its totient is φ = 267091248.

The previous prime is 667728121. The next prime is 667728137. The reversal of 667728130 is 31827766.

It can be written as a sum of positive squares in 2 ways, for example, as 651831961 + 15896169 = 25531^2 + 3987^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (667728137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33386397 + ... + 33386416.

Almost surely, 2^667728130 is an apocalyptic number.

667728130 is a deficient number, since it is larger than the sum of its proper divisors (534182522).

667728130 is a wasteful number, since it uses less digits than its factorization.

667728130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66772820.

The product of its (nonzero) digits is 84672, while the sum is 40.

The square root of 667728130 is about 25840.4359483349. The cubic root of 667728130 is about 874.0438557030.

The spelling of 667728130 in words is "six hundred sixty-seven million, seven hundred twenty-eight thousand, one hundred thirty".