2578728 has 32 divisors (see below), whose sum is σ = 6501600. Its totient is φ = 852288.

The previous prime is 2578721. The next prime is 2578729. The reversal of 2578728 is 8278752.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (2578721) 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, 2950 + ... + 3722.

It is an arithmetic number, because the mean of its divisors is an integer number (203175).

2^2578728 is an apocalyptic number.

It is an amenable number.

2578728 is an abundant number, since it is smaller than the sum of its proper divisors (3922872).

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

2578728 is a wasteful number, since it uses less digits than its factorization.

2578728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 921 (or 917 counting only the distinct ones).

The product of its digits is 62720, while the sum is 39.

The square root of 2578728 is about 1605.8418353001. The cubic root of 2578728 is about 137.1308533641.

The spelling of 2578728 in words is "two million, five hundred seventy-eight thousand, seven hundred twenty-eight".