55087280 has 20 divisors (see below), whose sum is σ = 128078112. Its totient is φ = 22034880.

The previous prime is 55087261. The next prime is 55087283. The reversal of 55087280 is 8278055.

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-3 number, since 3×55087280³ (a number of 24 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 55087280.

It is not an unprimeable number, because it can be changed into a prime (55087283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 344216 + ... + 344375.

Almost surely, 2^55087280 is an apocalyptic number.

It is an amenable number.

55087280 is an abundant number, since it is smaller than the sum of its proper divisors (72990832).

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

55087280 is a wasteful number, since it uses less digits than its factorization.

55087280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 688604 (or 688598 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 35.

The square root of 55087280 is about 7422.0805708373. The cubic root of 55087280 is about 380.4963044209.

The spelling of 55087280 in words is "fifty-five million, eighty-seven thousand, two hundred eighty".