561550640 has 40 divisors (see below), whose sum is σ = 1492121760. Its totient is φ = 192531456.

The previous prime is 561550603. The next prime is 561550657. The reversal of 561550640 is 46055165.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 561550597 and 561550606.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 500825 + ... + 501944.

It is an arithmetic number, because the mean of its divisors is an integer number (37303044).

Almost surely, 2^561550640 is an apocalyptic number.

It is an amenable number.

561550640 is an abundant number, since it is smaller than the sum of its proper divisors (930571120).

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

561550640 is a wasteful number, since it uses less digits than its factorization.

561550640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1002789 (or 1002783 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 561550640 is about 23697.0597332243. The cubic root of 561550640 is about 825.0171480978.

The spelling of 561550640 in words is "five hundred sixty-one million, five hundred fifty thousand, six hundred forty".