561552740 has 96 divisors (see below), whose sum is σ = 1389696000. Its totient is φ = 190512000.

The previous prime is 561552707. The next prime is 561552743. The reversal of 561552740 is 47255165.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 561552740.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561552743) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 747365 + ... + 748115.

It is an arithmetic number, because the mean of its divisors is an integer number (14476000).

Almost surely, 2^561552740 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 561552740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (694848000).

561552740 is an abundant number, since it is smaller than the sum of its proper divisors (828143260).

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

561552740 is a wasteful number, since it uses less digits than its factorization.

561552740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 890 (or 874 counting only the distinct ones).

The product of its (nonzero) digits is 42000, while the sum is 35.

The square root of 561552740 is about 23697.1040424774. The cubic root of 561552740 is about 825.0181765203.

The spelling of 561552740 in words is "five hundred sixty-one million, five hundred fifty-two thousand, seven hundred forty".