55558140 has 48 divisors (see below), whose sum is σ = 169706880. Its totient is φ = 13468480.

The previous prime is 55558121. The next prime is 55558163. The reversal of 55558140 is 4185555.

It is a Harshad number since it is a multiple of its sum of digits (33).

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, 41430 + ... + 42749.

It is an arithmetic number, because the mean of its divisors is an integer number (3535560).

Almost surely, 2^55558140 is an apocalyptic number.

It is an amenable number.

55558140 is an abundant number, since it is smaller than the sum of its proper divisors (114148740).

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

55558140 is a wasteful number, since it uses less digits than its factorization.

55558140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84202 (or 84200 counting only the distinct ones).

The product of its (nonzero) digits is 20000, while the sum is 33.

The square root of 55558140 is about 7453.7332927869. The cubic root of 55558140 is about 381.5773309934.

It can be divided in two parts, 5555 and 8140, that added together give a triangular number (13695 = T₁₆₅).

The spelling of 55558140 in words is "fifty-five million, five hundred fifty-eight thousand, one hundred forty".