55478725 has 18 divisors (see below), whose sum is σ = 70746774. Its totient is φ = 43156800.

The previous prime is 55478719. The next prime is 55478743. The reversal of 55478725 is 52787455.

55478725 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 9 ways, for example, as 214369 + 55264356 = 463^2 + 7434^2 .

It is not a de Polignac number, because 55478725 - 2⁵ = 55478693 is a prime.

It is a Duffinian number.

It is a congruent number.

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 17 ways as a sum of consecutive naturals, for example, 33415 + ... + 35035.

Almost surely, 2^55478725 is an apocalyptic number.

It is an amenable number.

55478725 is a deficient number, since it is larger than the sum of its proper divisors (15268049).

55478725 is a wasteful number, since it uses less digits than its factorization.

55478725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1705 (or 1663 counting only the distinct ones).

The product of its digits is 392000, while the sum is 43.

The square root of 55478725 is about 7448.4041915030. The cubic root of 55478725 is about 381.3954349736.

The spelling of 55478725 in words is "fifty-five million, four hundred seventy-eight thousand, seven hundred twenty-five".