56017720 has 64 divisors (see below), whose sum is σ = 145605600. Its totient is φ = 19169280.

The previous prime is 56017697. The next prime is 56017733. The reversal of 56017720 is 2771065.

56017720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 15 ways as a sum of consecutive naturals, for example, 3736 + ... + 11224.

Almost surely, 2^56017720 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 56017720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72802800).

56017720 is an abundant number, since it is smaller than the sum of its proper divisors (89587880).

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

56017720 is a wasteful number, since it uses less digits than its factorization.

56017720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7528 (or 7524 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 28.

The square root of 56017720 is about 7484.4986472041. The cubic root of 56017720 is about 382.6265860376.

Adding to 56017720 its reverse (2771065), we get a palindrome (58788785).

The spelling of 56017720 in words is "fifty-six million, seventeen thousand, seven hundred twenty".