561773646 has 48 divisors (see below), whose sum is σ = 1464278400.
Its totient is φ = 152058384.
The previous prime is 561773623. The next prime is 561773669. The reversal of 561773646 is 646377165.
It is an interprime number because it is at equal distance from previous prime (561773623) and next prime (561773669).
It is a congruent number.
It is an unprimeable number.
It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 114936 + ... + 119723.
It is an arithmetic number, because the mean of its divisors is an integer number (30505800).
Almost surely, 2561773646 is an apocalyptic number.
561773646 is an abundant number, since it is smaller than the sum of its proper divisors (902504754).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
561773646 is a wasteful number, since it uses less digits than its factorization.
561773646 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 234693 (or 234690 counting only the distinct ones).
The product of its digits is 635040, while the sum is 45.
The square root of 561773646 is about 23701.7646178507.
The cubic root of 561773646 is about 825.1263453880.
The spelling of 561773646 in words is "five hundred sixty-one million, seven hundred seventy-three thousand, six hundred forty-six".