667998029 has 8 divisors (see below), whose sum is σ = 708695040. Its totient is φ = 627854976.

The previous prime is 667997989. The next prime is 667998043. The reversal of 667998029 is 920899766.

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

It is a cyclic number.

It is not a de Polignac number, because 667998029 - 2⁸ = 667997773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667998229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 136004 + ... + 140829.

It is an arithmetic number, because the mean of its divisors is an integer number (88586880).

Almost surely, 2^667998029 is an apocalyptic number.

It is an amenable number.

667998029 is a deficient number, since it is larger than the sum of its proper divisors (40697011).

667998029 is a wasteful number, since it uses less digits than its factorization.

667998029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276979.

The product of its (nonzero) digits is 2939328, while the sum is 56.

The square root of 667998029 is about 25845.6578364723. The cubic root of 667998029 is about 874.1616041172.

The spelling of 667998029 in words is "six hundred sixty-seven million, nine hundred ninety-eight thousand, twenty-nine".