2557780328 has 16 divisors (see below), whose sum is σ = 4813155780. Its totient is φ = 1274272128.

The previous prime is 2557780321. The next prime is 2557780349. The reversal of 2557780328 is 8230877552.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2184440644 + 373339684 = 46738^2 + 19322^2 .

It is not an unprimeable number, because it can be changed into a prime (2557780321) 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 3 ways as a sum of consecutive naturals, for example, 574901 + ... + 579332.

Almost surely, 2^2557780328 is an apocalyptic number.

It is an amenable number.

2557780328 is a deficient number, since it is larger than the sum of its proper divisors (2255375452).

2557780328 is a wasteful number, since it uses less digits than its factorization.

2557780328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1154516 (or 1154512 counting only the distinct ones).

The product of its (nonzero) digits is 940800, while the sum is 47.

The square root of 2557780328 is about 50574.5027459490. The cubic root of 2557780328 is about 1367.5852695020.

The spelling of 2557780328 in words is "two billion, five hundred fifty-seven million, seven hundred eighty thousand, three hundred twenty-eight".