6778688 has 28 divisors (see below), whose sum is σ = 15374112. Its totient is φ = 2904960.

The previous prime is 6778661. The next prime is 6778691. The reversal of 6778688 is 8868776.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (28).

It is a super-2 number, since 2×6778688² = 91901222002688, which contains 22 as substring.

It is a nialpdrome in base 14.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7118 + ... + 8013.

Almost surely, 2^6778688 is an apocalyptic number.

It is an amenable number.

6778688 is an abundant number, since it is smaller than the sum of its proper divisors (8595424).

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

6778688 is a wasteful number, since it uses less digits than its factorization.

6778688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15150 (or 15140 counting only the distinct ones).

The product of its digits is 903168, while the sum is 50.

The square root of 6778688 is about 2603.5913657869. The cubic root of 6778688 is about 189.2555169648.

The spelling of 6778688 in words is "six million, seven hundred seventy-eight thousand, six hundred eighty-eight".