55555280 has 40 divisors (see below), whose sum is σ = 140910624. Its totient is φ = 20201600.

The previous prime is 55555267. The next prime is 55555307. The reversal of 55555280 is 8255555.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 55555280.

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, 30686 + ... + 32445.

Almost surely, 2^55555280 is an apocalyptic number.

It is an amenable number.

55555280 is an abundant number, since it is smaller than the sum of its proper divisors (85355344).

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

55555280 is a wasteful number, since it uses less digits than its factorization.

55555280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63155 (or 63149 counting only the distinct ones).

The product of its (nonzero) digits is 50000, while the sum is 35.

The square root of 55555280 is about 7453.5414401478. The cubic root of 55555280 is about 381.5707833187.

The spelling of 55555280 in words is "fifty-five million, five hundred fifty-five thousand, two hundred eighty".