55380540 has 48 divisors (see below), whose sum is σ = 156022272. Its totient is φ = 14677056.

The previous prime is 55380529. The next prime is 55380551. The reversal of 55380540 is 4508355.

It is an interprime number because it is at equal distance from previous prime (55380529) and next prime (55380551).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 55380498 and 55380507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7257 + ... + 12783.

It is an arithmetic number, because the mean of its divisors is an integer number (3250464).

Almost surely, 2^55380540 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 55380540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78011136).

55380540 is an abundant number, since it is smaller than the sum of its proper divisors (100641732).

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

55380540 is a wasteful number, since it uses less digits than its factorization.

55380540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5706 (or 5704 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

The square root of 55380540 is about 7441.8102636388. The cubic root of 55380540 is about 381.1703070910.

Adding to 55380540 its reverse (4508355), we get a palindrome (59888895).

The spelling of 55380540 in words is "fifty-five million, three hundred eighty thousand, five hundred forty".