55278145 has 8 divisors (see below), whose sum is σ = 71436456. Its totient is φ = 40820736.

The previous prime is 55278137. The next prime is 55278173. The reversal of 55278145 is 54187255.

55278145 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 4 ways, for example, as 266256 + 55011889 = 516^2 + 7417^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55278145 - 2³ = 55278137 is a prime.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 425152 + ... + 425281.

It is an arithmetic number, because the mean of its divisors is an integer number (8929557).

Almost surely, 2^55278145 is an apocalyptic number.

It is an amenable number.

55278145 is a deficient number, since it is larger than the sum of its proper divisors (16158311).

55278145 is a wasteful number, since it uses less digits than its factorization.

55278145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 850451.

The product of its digits is 56000, while the sum is 37.

The square root of 55278145 is about 7434.9273701900. The cubic root of 55278145 is about 380.9352424941.

It can be divided in two parts, 552781 and 45, that added together give a triangular number (552826 = T₁₀₅₁).

The spelling of 55278145 in words is "fifty-five million, two hundred seventy-eight thousand, one hundred forty-five".