55145280 has 224 divisors, whose sum is σ = 193121280. Its totient is φ = 13271040.

The previous prime is 55145213. The next prime is 55145291. The reversal of 55145280 is 8254155.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 505866 + ... + 505974.

Almost surely, 2^55145280 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 55145280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96560640).

55145280 is an abundant number, since it is smaller than the sum of its proper divisors (137976000).

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

55145280 is a wasteful number, since it uses less digits than its factorization.

55145280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177 (or 167 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 30.

The square root of 55145280 is about 7425.9868031124. The cubic root of 55145280 is about 380.6297958849.

The spelling of 55145280 in words is "fifty-five million, one hundred forty-five thousand, two hundred eighty".