2178428 has 12 divisors (see below), whose sum is σ = 4356912. Its totient is φ = 933600.

The previous prime is 2178419. The next prime is 2178433. The reversal of 2178428 is 8248712.

2178428 is digitally balanced in base 8, because in such base it contains all the possibile digits an equal number of times.

2178428 is an admirable number.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

2178428 is strictly pandigital in base 8.

It is a junction number, because it is equal to n+sod(n) for n = 2178394 and 2178403.

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, 38873 + ... + 38928.

It is an arithmetic number, because the mean of its divisors is an integer number (363076).

2^2178428 is an apocalyptic number.

2178428 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

2178428 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

2178428 is a wasteful number, since it uses less digits than its factorization.

2178428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77812 (or 77810 counting only the distinct ones).

The product of its digits is 7168, while the sum is 32.

The square root of 2178428 is about 1475.9498636471. The cubic root of 2178428 is about 129.6326513017.

It can be divided in two parts, 21784 and 28, that added together give a palindrome (21812).

The spelling of 2178428 in words is "two million, one hundred seventy-eight thousand, four hundred twenty-eight".