561187728 has 60 divisors (see below), whose sum is σ = 1572222288. Its totient is φ = 186863040.

The previous prime is 561187717. The next prime is 561187771. The reversal of 561187728 is 827781165.

It is a happy number.

561187728 is a `hidden beast` number, since 5 + 611 + 8 + 7 + 7 + 28 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 204123 + ... + 206853.

Almost surely, 2^561187728 is an apocalyptic number.

It is an amenable number.

561187728 is an abundant number, since it is smaller than the sum of its proper divisors (1011034560).

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

561187728 is a wasteful number, since it uses less digits than its factorization.

561187728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4172 (or 4163 counting only the distinct ones).

The product of its digits is 188160, while the sum is 45.

The square root of 561187728 is about 23689.4011743649. The cubic root of 561187728 is about 824.8393825059.

It can be divided in two parts, 5611 and 87728, that added together give a palindrome (93339).

The spelling of 561187728 in words is "five hundred sixty-one million, one hundred eighty-seven thousand, seven hundred twenty-eight".