6777778 has 48 divisors (see below), whose sum is σ = 12870144. Its totient is φ = 2661120.

The previous prime is 6777769. The next prime is 6777803. The reversal of 6777778 is 8777776.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a plaindrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 69826 + ... + 69922.

It is an arithmetic number, because the mean of its divisors is an integer number (268128).

Almost surely, 2^6777778 is an apocalyptic number.

6777778 is a deficient number, since it is larger than the sum of its proper divisors (6092366).

6777778 is a wasteful number, since it uses less digits than its factorization.

6777778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167 (or 160 counting only the distinct ones).

The product of its digits is 806736, while the sum is 49.

The square root of 6777778 is about 2603.4166013145. The cubic root of 6777778 is about 189.2470477631.

The spelling of 6777778 in words is "six million, seven hundred seventy-seven thousand, seven hundred seventy-eight".