15561128 has 32 divisors (see below), whose sum is σ = 32175360. Its totient is φ = 6996480.

The previous prime is 15561083. The next prime is 15561131. The reversal of 15561128 is 82116551.

It is a self number, because there is not a number n which added to its sum of digits gives 15561128.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7625 + ... + 9447.

It is an arithmetic number, because the mean of its divisors is an integer number (1005480).

Almost surely, 2^15561128 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15561128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16087680).

15561128 is an abundant number, since it is smaller than the sum of its proper divisors (16614232).

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

15561128 is a wasteful number, since it uses less digits than its factorization.

15561128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1937 (or 1933 counting only the distinct ones).

The product of its digits is 2400, while the sum is 29.

The square root of 15561128 is about 3944.7595617477. The cubic root of 15561128 is about 249.6588841048.

Adding to 15561128 its reverse (82116551), we get a palindrome (97677679).

The spelling of 15561128 in words is "fifteen million, five hundred sixty-one thousand, one hundred twenty-eight".