1128556387 has 12 divisors (see below), whose sum is σ = 1369890576. Its totient is φ = 925275120.

The previous prime is 1128556381. The next prime is 1128556397. The reversal of 1128556387 is 7836558211.

It is not a de Polignac number, because 1128556387 - 2³ = 1128556379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1128556381) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 499564 + ... + 501817.

It is an arithmetic number, because the mean of its divisors is an integer number (114157548).

Almost surely, 2^1128556387 is an apocalyptic number.

1128556387 is a deficient number, since it is larger than the sum of its proper divisors (241334189).

1128556387 is a wasteful number, since it uses less digits than its factorization.

1128556387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1001418 (or 1001411 counting only the distinct ones).

The product of its digits is 403200, while the sum is 46.

The square root of 1128556387 is about 33593.9933172584. The cubic root of 1128556387 is about 1041.1366969434.

The spelling of 1128556387 in words is "one billion, one hundred twenty-eight million, five hundred fifty-six thousand, three hundred eighty-seven".