6619998 has 96 divisors (see below), whose sum is σ = 17729280. Its totient is φ = 1626240.

The previous prime is 6619981. The next prime is 6620011. The reversal of 6619998 is 8999166.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 74338 + ... + 74426.

It is an arithmetic number, because the mean of its divisors is an integer number (184680).

Almost surely, 2^6619998 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6619998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8864640).

6619998 is an abundant number, since it is smaller than the sum of its proper divisors (11109282).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6619998 is a wasteful number, since it uses less digits than its factorization.

6619998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142 (or 135 counting only the distinct ones).

The product of its digits is 209952, while the sum is 48.

The square root of 6619998 is about 2572.9356773927. The cubic root of 6619998 is about 187.7670080331.

The spelling of 6619998 in words is "six million, six hundred nineteen thousand, nine hundred ninety-eight".