55284240 has 160 divisors (see below), whose sum is σ = 191702016. Its totient is φ = 13063680.

The previous prime is 55284217. The next prime is 55284241. The reversal of 55284240 is 4248255.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 55284198 and 55284207.

It is not an unprimeable number, because it can be changed into a prime (55284241) 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, 113277 + ... + 113763.

Almost surely, 2^55284240 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 55284240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95851008).

55284240 is an abundant number, since it is smaller than the sum of its proper divisors (136417776).

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

55284240 is a wasteful number, since it uses less digits than its factorization.

55284240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 557 (or 551 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 30.

The square root of 55284240 is about 7435.3372485718. The cubic root of 55284240 is about 380.9492426924.

The spelling of 55284240 in words is "fifty-five million, two hundred eighty-four thousand, two hundred forty".