667206772 has 6 divisors (see below), whose sum is σ = 1167611858. Its totient is φ = 333603384.

The previous prime is 667206737. The next prime is 667206773. The reversal of 667206772 is 277602766.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 550653156 + 116553616 = 23466^2 + 10796^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667206773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83400843 + ... + 83400850.

Almost surely, 2^667206772 is an apocalyptic number.

It is an amenable number.

667206772 is a deficient number, since it is larger than the sum of its proper divisors (500405086).

667206772 is a wasteful number, since it uses less digits than its factorization.

667206772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166801697 (or 166801695 counting only the distinct ones).

The product of its (nonzero) digits is 296352, while the sum is 43.

The square root of 667206772 is about 25830.3459519999. The cubic root of 667206772 is about 873.8163137901.

The spelling of 667206772 in words is "six hundred sixty-seven million, two hundred six thousand, seven hundred seventy-two".