561543600 has 60 divisors (see below), whose sum is σ = 1798815176. Its totient is φ = 149744640.

The previous prime is 561543589. The next prime is 561543607. The reversal of 561543600 is 6345165.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (561543607) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 232777 + ... + 235176.

Almost surely, 2^561543600 is an apocalyptic number.

561543600 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

561543600 is an abundant number, since it is smaller than the sum of its proper divisors (1237271576).

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

561543600 is a wasteful number, since it uses less digits than its factorization.

561543600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467974 (or 467963 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 561543600 is about 23696.9111911236. The cubic root of 561543600 is about 825.0137004153.

Adding to 561543600 its reverse (6345165), we get a palindrome (567888765).

The spelling of 561543600 in words is "five hundred sixty-one million, five hundred forty-three thousand, six hundred".