561777144 has 32 divisors (see below), whose sum is σ = 1405026000. Its totient is φ = 187181312.

The previous prime is 561777143. The next prime is 561777163. The reversal of 561777144 is 441777165.

It is a junction number, because it is equal to n+sod(n) for n = 561777096 and 561777105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561777143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103162 + ... + 108470.

Almost surely, 2^561777144 is an apocalyptic number.

It is an amenable number.

561777144 is an abundant number, since it is smaller than the sum of its proper divisors (843248856).

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

561777144 is a wasteful number, since it uses less digits than its factorization.

561777144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9727 (or 9723 counting only the distinct ones).

The product of its digits is 164640, while the sum is 42.

The square root of 561777144 is about 23701.8384097099. The cubic root of 561777144 is about 825.1280579912.

The spelling of 561777144 in words is "five hundred sixty-one million, seven hundred seventy-seven thousand, one hundred forty-four".