669999998 has 8 divisors (see below), whose sum is σ = 1005413808. Its totient is φ = 334862064.

The previous prime is 669999989. The next prime is 670000013. The reversal of 669999998 is 899999966.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62786 + ... + 72677.

It is an arithmetic number, because the mean of its divisors is an integer number (125676726).

Almost surely, 2^669999998 is an apocalyptic number.

669999998 is a deficient number, since it is larger than the sum of its proper divisors (335413810).

669999998 is a wasteful number, since it uses less digits than its factorization.

669999998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137938.

The product of its digits is 153055008, while the sum is 74.

The square root of 669999998 is about 25884.3581724562. The cubic root of 669999998 is about 875.0340114126.

The spelling of 669999998 in words is "six hundred sixty-nine million, nine hundred ninety-nine thousand, nine hundred ninety-eight".