6689998 has 8 divisors (see below), whose sum is σ = 11468592. Its totient is φ = 2867136.

The previous prime is 6689989. The next prime is 6689999. The reversal of 6689998 is 8999866.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6689999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 238915 + ... + 238942.

It is an arithmetic number, because the mean of its divisors is an integer number (1433574).

Almost surely, 2^6689998 is an apocalyptic number.

6689998 is a deficient number, since it is larger than the sum of its proper divisors (4778594).

6689998 is a wasteful number, since it uses less digits than its factorization.

6689998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 477866.

The product of its digits is 1679616, while the sum is 55.

The square root of 6689998 is about 2586.5030446531. The cubic root of 6689998 is about 188.4265063987.

The spelling of 6689998 in words is "six million, six hundred eighty-nine thousand, nine hundred ninety-eight".