667970690 has 8 divisors (see below), whose sum is σ = 1202347260. Its totient is φ = 267188272.

The previous prime is 667970687. The next prime is 667970711. The reversal of 667970690 is 96079766.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 633478561 + 34492129 = 25169^2 + 5873^2 .

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

It is a super-2 number, since 2×667970690² = 892369685398152200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 33398525 + ... + 33398544.

Almost surely, 2^667970690 is an apocalyptic number.

667970690 is a deficient number, since it is larger than the sum of its proper divisors (534376570).

667970690 is a wasteful number, since it uses less digits than its factorization.

667970690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66797076.

The product of its (nonzero) digits is 857304, while the sum is 50.

The square root of 667970690 is about 25845.1289414466. The cubic root of 667970690 is about 874.1496784183.

The spelling of 667970690 in words is "six hundred sixty-seven million, nine hundred seventy thousand, six hundred ninety".