55184640 has 144 divisors (see below), whose sum is σ = 201522048. Its totient is φ = 12607488.

The previous prime is 55184639. The next prime is 55184671. The reversal of 55184640 is 4648155.

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, 25854 + ... + 27906.

Almost surely, 2^55184640 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 55184640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100761024).

55184640 is an abundant number, since it is smaller than the sum of its proper divisors (146337408).

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

55184640 is a wasteful number, since it uses less digits than its factorization.

55184640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2084 (or 2070 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 33.

The square root of 55184640 is about 7428.6364832316. The cubic root of 55184640 is about 380.7203326501.

The spelling of 55184640 in words is "fifty-five million, one hundred eighty-four thousand, six hundred forty".