55580140 has 144 divisors (see below), whose sum is σ = 156050496. Its totient is φ = 16220160.

The previous prime is 55580113. The next prime is 55580141. The reversal of 55580140 is 4108555.

55580140 is nontrivially palindromic in base 3.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 55580099 and 55580108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55580141) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 287884 + ... + 288076.

It is an arithmetic number, because the mean of its divisors is an integer number (1083684).

Almost surely, 2^55580140 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 55580140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78025248).

55580140 is an abundant number, since it is smaller than the sum of its proper divisors (100470356).

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

55580140 is a wasteful number, since it uses less digits than its factorization.

55580140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248 (or 235 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 28.

The square root of 55580140 is about 7455.2089172605. The cubic root of 55580140 is about 381.6276902116.

Adding to 55580140 its reverse (4108555), we get a palindrome (59688695).

The spelling of 55580140 in words is "fifty-five million, five hundred eighty thousand, one hundred forty".