55185840 has 160 divisors (see below), whose sum is σ = 196862400. Its totient is φ = 14192640.

The previous prime is 55185803. The next prime is 55185847. The reversal of 55185840 is 4858155.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 55185795 and 55185804.

It is not an unprimeable number, because it can be changed into a prime (55185847) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 62200 + ... + 63080.

It is an arithmetic number, because the mean of its divisors is an integer number (1230390).

Almost surely, 2^55185840 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 55185840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98431200).

55185840 is an abundant number, since it is smaller than the sum of its proper divisors (141676560).

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

55185840 is a wasteful number, since it uses less digits than its factorization.

55185840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 932 (or 920 counting only the distinct ones).

The product of its (nonzero) digits is 32000, while the sum is 36.

The square root of 55185840 is about 7428.7172513160. The cubic root of 55185840 is about 380.7230922410.

The spelling of 55185840 in words is "fifty-five million, one hundred eighty-five thousand, eight hundred forty".