2178678 has 16 divisors (see below), whose sum is σ = 4388400. Its totient is φ = 721056.

The previous prime is 2178677. The next prime is 2178679. The reversal of 2178678 is 8768712.

It is an interprime number because it is at equal distance from previous prime (2178677) and next prime (2178679).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2178677) 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, 325 + ... + 2112.

It is an arithmetic number, because the mean of its divisors is an integer number (274275).

2^2178678 is an apocalyptic number.

2178678 is an abundant number, since it is smaller than the sum of its proper divisors (2209722).

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

2178678 is a wasteful number, since it uses less digits than its factorization.

2178678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2591.

The product of its digits is 37632, while the sum is 39.

The square root of 2178678 is about 1476.0345524411. The cubic root of 2178678 is about 129.6376100645.

The spelling of 2178678 in words is "two million, one hundred seventy-eight thousand, six hundred seventy-eight".