2778678 has 32 divisors (see below), whose sum is σ = 7057920. Its totient is φ = 793800.

The previous prime is 2778673. The next prime is 2778689. The reversal of 2778678 is 8768772.

2778678 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2778673) by changing a digit.

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, 3298 + ... + 4053.

It is an arithmetic number, because the mean of its divisors is an integer number (220560).

2^2778678 is an apocalyptic number.

2778678 is an abundant number, since it is smaller than the sum of its proper divisors (4279242).

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

2778678 is a wasteful number, since it uses less digits than its factorization.

2778678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7369 (or 7363 counting only the distinct ones).

The product of its digits is 263424, while the sum is 45.

The square root of 2778678 is about 1666.9367114561. The cubic root of 2778678 is about 140.5872947800.

The spelling of 2778678 in words is "two million, seven hundred seventy-eight thousand, six hundred seventy-eight".