56081520 has 240 divisors, whose sum is σ = 210424032. Its totient is φ = 13271040.

The previous prime is 56081513. The next prime is 56081539. The reversal of 56081520 is 2518065.

56081520 = 278² + 279² + ... + 574².

56081520 is a `hidden beast` number, since 5 + 60 + 81 + 520 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 578112 + ... + 578208.

Almost surely, 2^56081520 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 56081520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105212016).

56081520 is an abundant number, since it is smaller than the sum of its proper divisors (154342512).

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

56081520 is a wasteful number, since it uses less digits than its factorization.

56081520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200 (or 191 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 56081520 is about 7488.7595768592. The cubic root of 56081520 is about 382.7717919617.

Adding to 56081520 its reverse (2518065), we get a palindrome (58599585).

The spelling of 56081520 in words is "fifty-six million, eighty-one thousand, five hundred twenty".