55406280 has 96 divisors (see below), whose sum is σ = 175564800. Its totient is φ = 13986432.

The previous prime is 55406257. The next prime is 55406291. The reversal of 55406280 is 8260455.

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42681 + ... + 43959.

It is an arithmetic number, because the mean of its divisors is an integer number (1828800).

Almost surely, 2^55406280 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 55406280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87782400).

55406280 is an abundant number, since it is smaller than the sum of its proper divisors (120158520).

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

55406280 is a wasteful number, since it uses less digits than its factorization.

55406280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1331 (or 1308 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 30.

The square root of 55406280 is about 7443.5394806503. The cubic root of 55406280 is about 381.2293519230.

The spelling of 55406280 in words is "fifty-five million, four hundred six thousand, two hundred eighty".