6557998 has 4 divisors (see below), whose sum is σ = 9837000. Its totient is φ = 3278998.

The previous prime is 6557981. The next prime is 6558007. The reversal of 6557998 is 8997556.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1639498 + ... + 1639501.

It is an arithmetic number, because the mean of its divisors is an integer number (2459250).

Almost surely, 2^6557998 is an apocalyptic number.

6557998 is a deficient number, since it is larger than the sum of its proper divisors (3279002).

6557998 is a wasteful number, since it uses less digits than its factorization.

6557998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3279001.

The product of its digits is 680400, while the sum is 49.

The square root of 6557998 is about 2560.8588403112. The cubic root of 6557998 is about 187.1789873108.

The spelling of 6557998 in words is "six million, five hundred fifty-seven thousand, nine hundred ninety-eight".