55871244 has 72 divisors (see below), whose sum is σ = 165935952. Its totient is φ = 15626880.

The previous prime is 55871239. The next prime is 55871251. The reversal of 55871244 is 44217855.

It is a super-2 number, since 2×55871244² = 6243191812215072, which contains 22 as substring.

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 = 55871199 and 55871208.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 279 + ... + 10574.

It is an arithmetic number, because the mean of its divisors is an integer number (2304666).

Almost surely, 2^55871244 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 55871244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82967976).

55871244 is an abundant number, since it is smaller than the sum of its proper divisors (110064708).

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

55871244 is a wasteful number, since it uses less digits than its factorization.

55871244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10887 (or 10882 counting only the distinct ones).

The product of its digits is 44800, while the sum is 36.

The square root of 55871244 is about 7474.7069507774. The cubic root of 55871244 is about 382.2927956314.

The spelling of 55871244 in words is "fifty-five million, eight hundred seventy-one thousand, two hundred forty-four".