1139563728 has 100 divisors (see below), whose sum is σ = 3310587588. Its totient is φ = 378432000.

The previous prime is 1139563721. The next prime is 1139563757. The reversal of 1139563728 is 8273659311.

1139563728 is a `hidden beast` number, since 1 + 1 + 3 + 9 + 5 + 637 + 2 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 886371984 + 253191744 = 29772^2 + 15912^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1139563721) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 378228 + ... + 381228.

Almost surely, 2^1139563728 is an apocalyptic number.

1139563728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1139563728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1655293794).

1139563728 is an abundant number, since it is smaller than the sum of its proper divisors (2171023860).

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

1139563728 is a wasteful number, since it uses less digits than its factorization.

1139563728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3314 (or 3299 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 1139563728 is about 33757.4247832977. The cubic root of 1139563728 is about 1044.5106499085.

The spelling of 1139563728 in words is "one billion, one hundred thirty-nine million, five hundred sixty-three thousand, seven hundred twenty-eight".