2778432 has 56 divisors (see below), whose sum is σ = 7620000. Its totient is φ = 892416.

The previous prime is 2778421. The next prime is 2778439. The reversal of 2778432 is 2348772.

It is a junction number, because it is equal to n+sod(n) for n = 2778393 and 2778402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2778439) 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, 5319 + ... + 5817.

2^2778432 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 2778432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3810000).

2778432 is an abundant number, since it is smaller than the sum of its proper divisors (4841568).

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

2778432 is a wasteful number, since it uses less digits than its factorization.

2778432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543 (or 533 counting only the distinct ones).

The product of its digits is 18816, while the sum is 33.

The square root of 2778432 is about 1666.8629217785. The cubic root of 2778432 is about 140.5831458652.

The spelling of 2778432 in words is "two million, seven hundred seventy-eight thousand, four hundred thirty-two".