55281785 has 16 divisors (see below), whose sum is σ = 71757840. Its totient is φ = 40642560.

The previous prime is 55281781. The next prime is 55281803. The reversal of 55281785 is 58718255.

55281785 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 7284601 + 47997184 = 2699^2 + 6928^2 .

It is not a de Polignac number, because 55281785 - 2² = 55281781 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55281781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13901 + ... + 17429.

It is an arithmetic number, because the mean of its divisors is an integer number (4484865).

Almost surely, 2^55281785 is an apocalyptic number.

It is an amenable number.

55281785 is a deficient number, since it is larger than the sum of its proper divisors (16476055).

55281785 is a wasteful number, since it uses less digits than its factorization.

55281785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3788.

The product of its digits is 112000, while the sum is 41.

The square root of 55281785 is about 7435.1721567157. The cubic root of 55281785 is about 380.9436036879.

The spelling of 55281785 in words is "fifty-five million, two hundred eighty-one thousand, seven hundred eighty-five".