55445140 has 12 divisors (see below), whose sum is σ = 116434836. Its totient is φ = 22178048.

The previous prime is 55445119. The next prime is 55445141. The reversal of 55445140 is 4154455.

It can be written as a sum of positive squares in 2 ways, for example, as 32058244 + 23386896 = 5662^2 + 4836^2 .

It is a junction number, because it is equal to n+sod(n) for n = 55445099 and 55445108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55445141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1386109 + ... + 1386148.

It is an arithmetic number, because the mean of its divisors is an integer number (9702903).

Almost surely, 2^55445140 is an apocalyptic number.

It is an amenable number.

55445140 is an abundant number, since it is smaller than the sum of its proper divisors (60989696).

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

55445140 is a wasteful number, since it uses less digits than its factorization.

55445140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2772266 (or 2772264 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 28.

The square root of 55445140 is about 7446.1493404309. The cubic root of 55445140 is about 381.3184580105.

Adding to 55445140 its reverse (4154455), we get a palindrome (59599595).

The spelling of 55445140 in words is "fifty-five million, four hundred forty-five thousand, one hundred forty".