55440288 has 120 divisors (see below), whose sum is σ = 165845988. Its totient is φ = 18164736.

The previous prime is 55440263. The next prime is 55440313. The reversal of 55440288 is 88204455.

It is an interprime number because it is at equal distance from previous prime (55440263) and next prime (55440313).

It can be written as a sum of positive squares in 2 ways, for example, as 50296464 + 5143824 = 7092^2 + 2268^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 189070 + ... + 189362.

Almost surely, 2^55440288 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 55440288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82922994).

55440288 is an abundant number, since it is smaller than the sum of its proper divisors (110405700).

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

55440288 is a wasteful number, since it uses less digits than its factorization.

55440288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388 (or 371 counting only the distinct ones).

The product of its (nonzero) digits is 51200, while the sum is 36.

The square root of 55440288 is about 7445.8235273205. The cubic root of 55440288 is about 381.3073346362.

The spelling of 55440288 in words is "fifty-five million, four hundred forty thousand, two hundred eighty-eight".