1128428656 has 20 divisors (see below), whose sum is σ = 2187016272. Its totient is φ = 564037376.

The previous prime is 1128428647. The next prime is 1128428659. The reversal of 1128428656 is 6568248211.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1128428659) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52680 + ... + 70936.

Almost surely, 2^1128428656 is an apocalyptic number.

1128428656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1128428656 is a deficient number, since it is larger than the sum of its proper divisors (1058587616).

1128428656 is a wasteful number, since it uses less digits than its factorization.

1128428656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22128 (or 22122 counting only the distinct ones).

The product of its digits is 184320, while the sum is 43.

The square root of 1128428656 is about 33592.0921646747. The cubic root of 1128428656 is about 1041.0974165404.

The spelling of 1128428656 in words is "one billion, one hundred twenty-eight million, four hundred twenty-eight thousand, six hundred fifty-six".