561291040 has 96 divisors (see below), whose sum is σ = 1437004800. Its totient is φ = 206352384.

The previous prime is 561290957. The next prime is 561291047. The reversal of 561291040 is 40192165.

It is not an unprimeable number, because it can be changed into a prime (561291047) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 114561 + ... + 119359.

It is an arithmetic number, because the mean of its divisors is an integer number (14968800).

Almost surely, 2^561291040 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 561291040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (718502400).

561291040 is an abundant number, since it is smaller than the sum of its proper divisors (875713760).

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

561291040 is a wasteful number, since it uses less digits than its factorization.

561291040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4874 (or 4866 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 561291040 is about 23691.5816272363. The cubic root of 561291040 is about 824.8899957400.

The spelling of 561291040 in words is "five hundred sixty-one million, two hundred ninety-one thousand, forty".