2178072 has 72 divisors (see below), whose sum is σ = 6423300. Its totient is φ = 666432.

The previous prime is 2178049. The next prime is 2178073. The reversal of 2178072 is 2708712.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2178073) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 12079 + ... + 12257.

2^2178072 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2178072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3211650).

2178072 is an abundant number, since it is smaller than the sum of its proper divisors (4245228).

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

2178072 is a wasteful number, since it uses less digits than its factorization.

2178072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217 (or 197 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

The square root of 2178072 is about 1475.8292584171. The cubic root of 2178072 is about 129.6255893687.

The spelling of 2178072 in words is "two million, one hundred seventy-eight thousand, seventy-two".