1556885428 has 18 divisors (see below), whose sum is σ = 3169374306. Its totient is φ = 667236528.

The previous prime is 1556885377. The next prime is 1556885443. The reversal of 1556885428 is 8245886551.

It can be written as a sum of positive squares in only one way, i.e., 1326999184 + 229886244 = 36428^2 + 15162^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3971451 + ... + 3971842.

Almost surely, 2^1556885428 is an apocalyptic number.

It is an amenable number.

1556885428 is an abundant number, since it is smaller than the sum of its proper divisors (1612488878).

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

1556885428 is a wasteful number, since it uses less digits than its factorization.

1556885428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7943311 (or 7943302 counting only the distinct ones).

The product of its digits is 3072000, while the sum is 52.

The square root of 1556885428 is about 39457.3874958797. The cubic root of 1556885428 is about 1159.0056451056.

The spelling of 1556885428 in words is "one billion, five hundred fifty-six million, eight hundred eighty-five thousand, four hundred twenty-eight".