55881540 has 216 divisors, whose sum is σ = 201434688. Its totient is φ = 12430080.

The previous prime is 55881491. The next prime is 55881541. The reversal of 55881540 is 4518855.

55881540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 55881495 and 55881504.

It is not an unprimeable number, because it can be changed into a prime (55881541) by changing a digit.

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 71 ways as a sum of consecutive naturals, for example, 334537 + ... + 334703.

It is an arithmetic number, because the mean of its divisors is an integer number (932568).

Almost surely, 2^55881540 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 55881540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100717344).

55881540 is an abundant number, since it is smaller than the sum of its proper divisors (145553148).

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

55881540 is a wasteful number, since it uses less digits than its factorization.

55881540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219 (or 201 counting only the distinct ones).

The product of its (nonzero) digits is 32000, while the sum is 36.

The square root of 55881540 is about 7475.3956417035. The cubic root of 55881540 is about 382.3162772687.

It can be divided in two parts, 558815 and 40, that added together give a palindrome (558855).

The spelling of 55881540 in words is "fifty-five million, eight hundred eighty-one thousand, five hundred forty".