55478688 has 48 divisors (see below), whose sum is σ = 149577120. Its totient is φ = 17991936.

The previous prime is 55478677. The next prime is 55478693. The reversal of 55478688 is 88687455.

It is a tau number, because it is divible by the number of its divisors (48).

It is a self number, because there is not a number n which added to its sum of digits gives 55478688.

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 7 ways as a sum of consecutive naturals, for example, 4258 + ... + 11361.

It is an arithmetic number, because the mean of its divisors is an integer number (3116190).

Almost surely, 2^55478688 is an apocalyptic number.

It is an amenable number.

55478688 is an abundant number, since it is smaller than the sum of its proper divisors (94098432).

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

55478688 is a wasteful number, since it uses less digits than its factorization.

55478688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15669 (or 15661 counting only the distinct ones).

The product of its digits is 2150400, while the sum is 51.

The square root of 55478688 is about 7448.4017077491. The cubic root of 55478688 is about 381.3953501865.

The spelling of 55478688 in words is "fifty-five million, four hundred seventy-eight thousand, six hundred eighty-eight".