561738726 has 24 divisors (see below), whose sum is σ = 1262179464. Its totient is φ = 187246080.

The previous prime is 561738703. The next prime is 561738731. The reversal of 561738726 is 627837165.

561738726 is a `hidden beast` number, since 5 + 617 + 3 + 8 + 7 + 26 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 577435 + ... + 578406.

It is an arithmetic number, because the mean of its divisors is an integer number (52590811).

Almost surely, 2^561738726 is an apocalyptic number.

561738726 is an abundant number, since it is smaller than the sum of its proper divisors (700440738).

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

561738726 is a wasteful number, since it uses less digits than its factorization.

561738726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1155858 (or 1155846 counting only the distinct ones).

The product of its digits is 423360, while the sum is 45.

The square root of 561738726 is about 23701.0279523906. The cubic root of 561738726 is about 825.1092483424.

The spelling of 561738726 in words is "five hundred sixty-one million, seven hundred thirty-eight thousand, seven hundred twenty-six".