561749730 has 16 divisors (see below), whose sum is σ = 1348199424. Its totient is φ = 149799920.

The previous prime is 561749707. The next prime is 561749761. The reversal of 561749730 is 37947165.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 9362466 + ... + 9362525.

It is an arithmetic number, because the mean of its divisors is an integer number (84262464).

Almost surely, 2^561749730 is an apocalyptic number.

561749730 is an abundant number, since it is smaller than the sum of its proper divisors (786449694).

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

561749730 is a wasteful number, since it uses less digits than its factorization.

561749730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18725001.

The product of its (nonzero) digits is 158760, while the sum is 42.

The square root of 561749730 is about 23701.2600930837. The cubic root of 561749730 is about 825.1146360446.

The spelling of 561749730 in words is "five hundred sixty-one million, seven hundred forty-nine thousand, seven hundred thirty".