55775478 has 16 divisors (see below), whose sum is σ = 121692096. Its totient is φ = 16901640.

The previous prime is 55775413. The next prime is 55775509. The reversal of 55775478 is 87457755.

It is a happy number.

55775478 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×55775478³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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 7 ways as a sum of consecutive naturals, for example, 422476 + ... + 422607.

It is an arithmetic number, because the mean of its divisors is an integer number (7605756).

Almost surely, 2^55775478 is an apocalyptic number.

55775478 is an abundant number, since it is smaller than the sum of its proper divisors (65916618).

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

55775478 is a wasteful number, since it uses less digits than its factorization.

55775478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 845099.

The product of its digits is 1372000, while the sum is 48.

The square root of 55775478 is about 7468.2981997240. The cubic root of 55775478 is about 382.0742479692.

The spelling of 55775478 in words is "fifty-five million, seven hundred seventy-five thousand, four hundred seventy-eight".