667072306 has 8 divisors (see below), whose sum is σ = 1001140524. Its totient is φ = 333358800.

The previous prime is 667072303. The next prime is 667072313. The reversal of 667072306 is 603270766.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 662599081 + 4473225 = 25741^2 + 2115^2 .

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

It is a super-2 number, since 2×667072306² = 889970922864315272, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (667072303) 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, 83925 + ... + 91528.

Almost surely, 2^667072306 is an apocalyptic number.

667072306 is a deficient number, since it is larger than the sum of its proper divisors (334068218).

667072306 is a wasteful number, since it uses less digits than its factorization.

667072306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177356.

The product of its (nonzero) digits is 63504, while the sum is 37.

The square root of 667072306 is about 25827.7429521048. The cubic root of 667072306 is about 873.7576081117.

The spelling of 667072306 in words is "six hundred sixty-seven million, seventy-two thousand, three hundred six".