55278180 has 48 divisors (see below), whose sum is σ = 171978240. Its totient is φ = 14740704.

The previous prime is 55278173. The next prime is 55278199. The reversal of 55278180 is 8187255.

It is a super-2 number, since 2×55278180² = 6111354368224800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50644 + ... + 51723.

It is an arithmetic number, because the mean of its divisors is an integer number (3582880).

Almost surely, 2^55278180 is an apocalyptic number.

It is an amenable number.

55278180 is an abundant number, since it is smaller than the sum of its proper divisors (116700060).

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

55278180 is a wasteful number, since it uses less digits than its factorization.

55278180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102385 (or 102377 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 36.

The square root of 55278180 is about 7434.9297239449. The cubic root of 55278180 is about 380.9353228919.

The spelling of 55278180 in words is "fifty-five million, two hundred seventy-eight thousand, one hundred eighty".