561728890 has 8 divisors (see below), whose sum is σ = 1011112020. Its totient is φ = 224691552.

The previous prime is 561728879. The next prime is 561728891. The reversal of 561728890 is 98827165.

It can be written as a sum of positive squares in 2 ways, for example, as 532363329 + 29365561 = 23073^2 + 5419^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 561728890.

It is not an unprimeable number, because it can be changed into a prime (561728891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28086435 + ... + 28086454.

Almost surely, 2^561728890 is an apocalyptic number.

561728890 is a deficient number, since it is larger than the sum of its proper divisors (449383130).

561728890 is a wasteful number, since it uses less digits than its factorization.

561728890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56172896.

The product of its (nonzero) digits is 241920, while the sum is 46.

The square root of 561728890 is about 23700.8204499338. The cubic root of 561728890 is about 825.1044324487.

The spelling of 561728890 in words is "five hundred sixty-one million, seven hundred twenty-eight thousand, eight hundred ninety".