561520890 has 96 divisors (see below), whose sum is σ = 1741901760. Its totient is φ = 128344608.

The previous prime is 561520867. The next prime is 561520901. The reversal of 561520890 is 98025165.

It is a happy number.

561520890 is a `hidden beast` number, since 56 + 1 + 520 + 89 + 0 = 666.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 7992 + ... + 34451.

It is an arithmetic number, because the mean of its divisors is an integer number (18144810).

Almost surely, 2^561520890 is an apocalyptic number.

561520890 is an abundant number, since it is smaller than the sum of its proper divisors (1180380870).

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

561520890 is a wasteful number, since it uses less digits than its factorization.

561520890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42473 (or 42460 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The square root of 561520890 is about 23696.4320099039. The cubic root of 561520890 is about 825.0025785043.

The spelling of 561520890 in words is "five hundred sixty-one million, five hundred twenty thousand, eight hundred ninety".