55481040 has 120 divisors (see below), whose sum is σ = 187675488. Its totient is φ = 14688000.

The previous prime is 55481039. The next prime is 55481057. The reversal of 55481040 is 4018455.

55481040 is a `hidden beast` number, since 554 + 8 + 104 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a junction number, because it is equal to n+sod(n) for n = 55480995 and 55481013.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 180567 + ... + 180873.

Almost surely, 2^55481040 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 55481040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93837744).

55481040 is an abundant number, since it is smaller than the sum of its proper divisors (132194448).

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

55481040 is a wasteful number, since it uses less digits than its factorization.

55481040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 577 (or 568 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 55481040 is about 7448.5595922970. The cubic root of 55481040 is about 381.4007398188.

Adding to 55481040 its reverse (4018455), we get a palindrome (59499495).

The spelling of 55481040 in words is "fifty-five million, four hundred eighty-one thousand, forty".