55018840 has 32 divisors (see below), whose sum is σ = 124938000. Its totient is φ = 21803904.

The previous prime is 55018807. The next prime is 55018871. The reversal of 55018840 is 4881055.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1950 + ... + 10669.

Almost surely, 2^55018840 is an apocalyptic number.

It is an amenable number.

55018840 is an abundant number, since it is smaller than the sum of its proper divisors (69919160).

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

55018840 is a wasteful number, since it uses less digits than its factorization.

55018840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12739 (or 12735 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 31.

The square root of 55018840 is about 7417.4685708805. The cubic root of 55018840 is about 380.3386639216.

Adding to 55018840 its reverse (4881055), we get a palindrome (59899895).

It can be divided in two parts, 5501 and 8840, that added together give a palindrome (14341).

The spelling of 55018840 in words is "fifty-five million, eighteen thousand, eight hundred forty".