561734780 has 24 divisors (see below), whose sum is σ = 1180101552. Its totient is φ = 224606592.

The previous prime is 561734759. The next prime is 561734821. The reversal of 561734780 is 87437165.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79679 + ... + 86441.

It is an arithmetic number, because the mean of its divisors is an integer number (49170898).

Almost surely, 2^561734780 is an apocalyptic number.

It is an amenable number.

561734780 is an abundant number, since it is smaller than the sum of its proper divisors (618366772).

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

561734780 is a wasteful number, since it uses less digits than its factorization.

561734780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10925 (or 10923 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 41.

The square root of 561734780 is about 23700.9447069099. The cubic root of 561734780 is about 825.1073163121.

The spelling of 561734780 in words is "five hundred sixty-one million, seven hundred thirty-four thousand, seven hundred eighty".