561729026 has 8 divisors (see below), whose sum is σ = 853259520. Its totient is φ = 277309188.

The previous prime is 561729019. The next prime is 561729059. The reversal of 561729026 is 620927165.

It is a happy number.

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

It is a Curzon number.

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 3 ways as a sum of consecutive naturals, for example, 1777466 + ... + 1777781.

It is an arithmetic number, because the mean of its divisors is an integer number (106657440).

Almost surely, 2^561729026 is an apocalyptic number.

561729026 is a deficient number, since it is larger than the sum of its proper divisors (291530494).

561729026 is a wasteful number, since it uses less digits than its factorization.

561729026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3555328.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 561729026 is about 23700.8233190326. The cubic root of 561729026 is about 825.1044990373.

It can be divided in two parts, 5617 and 29026, that added together give a palindrome (34643).

The spelling of 561729026 in words is "five hundred sixty-one million, seven hundred twenty-nine thousand, twenty-six".