2688378 has 72 divisors (see below), whose sum is σ = 7060704. Its totient is φ = 667920.

The previous prime is 2688377. The next prime is 2688391. The reversal of 2688378 is 8738862.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a d-powerful number, because it can be written as 2⁴ + 6⁵ + 8² + 8³ + 3¹³ + 7⁷ + 8⁶ .

It is not an unprimeable number, because it can be changed into a prime (2688373) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 116875 + ... + 116897.

2^2688378 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2688378, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3530352).

2688378 is an abundant number, since it is smaller than the sum of its proper divisors (4372326).

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

2688378 is a wasteful number, since it uses less digits than its factorization.

2688378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80 (or 46 counting only the distinct ones).

The product of its digits is 129024, while the sum is 42.

The square root of 2688378 is about 1639.6273966972. The cubic root of 2688378 is about 139.0475830399.

Multiplying 2688378 by its sum of digits (42), we get a square (112911876 = 10626²).

2688378 divided by its sum of digits (42) gives a square (64009 = 253²).

It can be divided in two parts, 2688 and 378, that multiplied together give a square (1016064 = 1008²).

The spelling of 2688378 in words is "two million, six hundred eighty-eight thousand, three hundred seventy-eight".