6778992 has 80 divisors (see below), whose sum is σ = 19677312. Its totient is φ = 1992960.

The previous prime is 6778973. The next prime is 6779023. The reversal of 6778992 is 2998776.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a d-powerful number, because it can be written as 6 + 7⁷ + 7⁸ + 8³ + 9 + 9⁵ + 2¹⁷ .

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 15 ways as a sum of consecutive naturals, for example, 19363 + ... + 19709.

Almost surely, 2^6778992 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6778992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9838656).

6778992 is an abundant number, since it is smaller than the sum of its proper divisors (12898320).

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

6778992 is a wasteful number, since it uses less digits than its factorization.

6778992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406 (or 400 counting only the distinct ones).

The product of its digits is 381024, while the sum is 48.

The square root of 6778992 is about 2603.6497460296. The cubic root of 6778992 is about 189.2583460677.

It can be divided in two parts, 677 and 8992, that added together give a palindrome (9669).

The spelling of 6778992 in words is "six million, seven hundred seventy-eight thousand, nine hundred ninety-two".