1138568728 has 16 divisors (see below), whose sum is σ = 2328890760. Its totient is φ = 517531200.

The previous prime is 1138568719. The next prime is 1138568731. The reversal of 1138568728 is 8278658311.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6469053 + ... + 6469228.

Almost surely, 2^1138568728 is an apocalyptic number.

It is an amenable number.

1138568728 is an abundant number, since it is smaller than the sum of its proper divisors (1190322032).

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

1138568728 is a wasteful number, since it uses less digits than its factorization.

1138568728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12938298 (or 12938294 counting only the distinct ones).

The product of its digits is 645120, while the sum is 49.

The square root of 1138568728 is about 33742.6840663276. The cubic root of 1138568728 is about 1044.2065596385.

The spelling of 1138568728 in words is "one billion, one hundred thirty-eight million, five hundred sixty-eight thousand, seven hundred twenty-eight".