56681240 has 144 divisors (see below), whose sum is σ = 163749600. Its totient is φ = 17592960.

The previous prime is 56681203. The next prime is 56681257. The reversal of 56681240 is 4218665.

It is a junction number, because it is equal to n+sod(n) for n = 56681197 and 56681206.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 237041 + ... + 237279.

It is an arithmetic number, because the mean of its divisors is an integer number (1137150).

Almost surely, 2^56681240 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 56681240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81874800).

56681240 is an abundant number, since it is smaller than the sum of its proper divisors (107068360).

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

56681240 is a wasteful number, since it uses less digits than its factorization.

56681240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286 (or 264 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 56681240 is about 7528.6944419335. The cubic root of 56681240 is about 384.1313750427.

The spelling of 56681240 in words is "fifty-six million, six hundred eighty-one thousand, two hundred forty".