55278144 has 84 divisors (see below), whose sum is σ = 166817040. Its totient is φ = 17452800.

The previous prime is 55278137. The next prime is 55278173. The reversal of 55278144 is 44187255.

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 = 55278099 and 55278108.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8419 + ... + 13469.

Almost surely, 2^55278144 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 55278144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83408520).

55278144 is an abundant number, since it is smaller than the sum of its proper divisors (111538896).

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

55278144 is a wasteful number, since it uses less digits than its factorization.

55278144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5088 (or 5075 counting only the distinct ones).

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

The square root of 55278144 is about 7434.9273029398. The cubic root of 55278144 is about 380.9352401970.

The spelling of 55278144 in words is "fifty-five million, two hundred seventy-eight thousand, one hundred forty-four".