6778998 has 32 divisors (see below), whose sum is σ = 15390720. Its totient is φ = 2210760.

The previous prime is 6778973. The next prime is 6779023. The reversal of 6778998 is 8998776.

It is an interprime number because it is at equal distance from previous prime (6778973) and next prime (6779023).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1203 + ... + 3873.

It is an arithmetic number, because the mean of its divisors is an integer number (480960).

Almost surely, 2^6778998 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6778998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7695360).

6778998 is an abundant number, since it is smaller than the sum of its proper divisors (8611722).

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

6778998 is a wasteful number, since it uses less digits than its factorization.

6778998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2729 (or 2723 counting only the distinct ones).

The product of its digits is 1524096, while the sum is 54.

The square root of 6778998 is about 2603.6508982581. The cubic root of 6778998 is about 189.2584019044.

It can be divided in two parts, 6778 and 998, that added together give a 5-th power (7776 = 6⁵).

The spelling of 6778998 in words is "six million, seven hundred seventy-eight thousand, nine hundred ninety-eight".