561642 has 8 divisors (see below), whose sum is σ = 1123296. Its totient is φ = 187212.

The previous prime is 561607. The next prime is 561667. The reversal of 561642 is 246165.

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

561642 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46798 + ... + 46809.

It is an arithmetic number, because the mean of its divisors is an integer number (140412).

2⁵⁶¹⁶⁴² is an apocalyptic number.

561642 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

561642 is a wasteful number, since it uses less digits than its factorization.

561642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93612.

The product of its digits is 1440, while the sum is 24.

The square root of 561642 is about 749.4277817108. The cubic root of 561642 is about 82.5061887001.

The spelling of 561642 in words is "five hundred sixty-one thousand, six hundred forty-two".