56681740 has 48 divisors (see below), whose sum is σ = 128997792. Its totient is φ = 20837376.

The previous prime is 56681719. The next prime is 56681741. The reversal of 56681740 is 4718665.

It is a self number, because there is not a number n which added to its sum of digits gives 56681740.

It is not an unprimeable number, because it can be changed into a prime (56681741) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 12682 + ... + 16558.

It is an arithmetic number, because the mean of its divisors is an integer number (2687454).

Almost surely, 2^56681740 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 56681740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64498896).

56681740 is an abundant number, since it is smaller than the sum of its proper divisors (72316052).

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

56681740 is a wasteful number, since it uses less digits than its factorization.

56681740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3946 (or 3944 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 56681740 is about 7528.7276481488. The cubic root of 56681740 is about 384.1325045471.

The spelling of 56681740 in words is "fifty-six million, six hundred eighty-one thousand, seven hundred forty".