2578356 has 72 divisors (see below), whose sum is σ = 7547904. Its totient is φ = 733440.

The previous prime is 2578351. The next prime is 2578391. The reversal of 2578356 is 6538752.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 2578356.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2578351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6541 + ... + 6923.

It is an arithmetic number, because the mean of its divisors is an integer number (104832).

2^2578356 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 2578356, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3773952).

2578356 is an abundant number, since it is smaller than the sum of its proper divisors (4969548).

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

2578356 is a wasteful number, since it uses less digits than its factorization.

2578356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421 (or 416 counting only the distinct ones).

The product of its digits is 50400, while the sum is 36.

The square root of 2578356 is about 1605.7260040243. The cubic root of 2578356 is about 137.1242590107.

The spelling of 2578356 in words is "two million, five hundred seventy-eight thousand, three hundred fifty-six".