55273280 has 56 divisors (see below), whose sum is σ = 138562080. Its totient is φ = 20943360.

The previous prime is 55273249. The next prime is 55273297. The reversal of 55273280 is 8237255.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1535 + ... + 10625.

Almost surely, 2^55273280 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 55273280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69281040).

55273280 is an abundant number, since it is smaller than the sum of its proper divisors (83288800).

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

55273280 is a wasteful number, since it uses less digits than its factorization.

55273280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9127 (or 9117 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 55273280 is about 7434.6001909988. The cubic root of 55273280 is about 380.9240668639.

The spelling of 55273280 in words is "fifty-five million, two hundred seventy-three thousand, two hundred eighty".