2557821384 has 48 divisors (see below), whose sum is σ = 6932502720. Its totient is φ = 851983200.

The previous prime is 2557821379. The next prime is 2557821391. The reversal of 2557821384 is 4831287552.

2557821384 is a `hidden beast` number, since 2 + 557 + 8 + 2 + 13 + 84 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 91909 + ... + 116459.

It is an arithmetic number, because the mean of its divisors is an integer number (144427140).

Almost surely, 2^2557821384 is an apocalyptic number.

2557821384 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

2557821384 is an abundant number, since it is smaller than the sum of its proper divisors (4374681336).

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

2557821384 is a wasteful number, since it uses less digits than its factorization.

2557821384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26010 (or 26003 counting only the distinct ones).

The product of its digits is 537600, while the sum is 45.

The square root of 2557821384 is about 50574.9086405502. The cubic root of 2557821384 is about 1367.5925866903.

The spelling of 2557821384 in words is "two billion, five hundred fifty-seven million, eight hundred twenty-one thousand, three hundred eighty-four".