6778428 has 24 divisors (see below), whose sum is σ = 15861888. Its totient is φ = 2252976.

The previous prime is 6778423. The next prime is 6778433. The reversal of 6778428 is 8248776.

It is an interprime number because it is at equal distance from previous prime (6778423) and next prime (6778433).

It is a self number, because there is not a number n which added to its sum of digits gives 6778428.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6778423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5475 + ... + 6597.

It is an arithmetic number, because the mean of its divisors is an integer number (660912).

Almost surely, 2^6778428 is an apocalyptic number.

It is an amenable number.

6778428 is an abundant number, since it is smaller than the sum of its proper divisors (9083460).

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

6778428 is a wasteful number, since it uses less digits than its factorization.

6778428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1633 (or 1631 counting only the distinct ones).

The product of its digits is 150528, while the sum is 42.

The square root of 6778428 is about 2603.5414342775. The cubic root of 6778428 is about 189.2530972702.

The spelling of 6778428 in words is "six million, seven hundred seventy-eight thousand, four hundred twenty-eight".