561687696 has 120 divisors (see below), whose sum is σ = 1653331680. Its totient is φ = 184571136.

The previous prime is 561687677. The next prime is 561687703. The reversal of 561687696 is 696786165.

561687696 is a `hidden beast` number, since 561 + 6 + 8 + 76 + 9 + 6 = 666.

It is a super-3 number, since 3×561687696³ (a number of 27 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 282835 + ... + 284813.

It is an arithmetic number, because the mean of its divisors is an integer number (13777764).

Almost surely, 2^561687696 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 561687696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (826665840).

561687696 is an abundant number, since it is smaller than the sum of its proper divisors (1091643984).

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

561687696 is a wasteful number, since it uses less digits than its factorization.

561687696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2075 (or 2057 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 54.

The square root of 561687696 is about 23699.9513923552. The cubic root of 561687696 is about 825.0842624678.

The spelling of 561687696 in words is "five hundred sixty-one million, six hundred eighty-seven thousand, six hundred ninety-six".