55551478 has 32 divisors (see below), whose sum is σ = 93817440. Its totient is φ = 24514560.

The previous prime is 55551449. The next prime is 55551479. The reversal of 55551478 is 87415555.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 55551478.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55551479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72618 + ... + 73378.

It is an arithmetic number, because the mean of its divisors is an integer number (2931795).

Almost surely, 2^55551478 is an apocalyptic number.

55551478 is a deficient number, since it is larger than the sum of its proper divisors (38265962).

55551478 is a wasteful number, since it uses less digits than its factorization.

55551478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 912.

The product of its digits is 140000, while the sum is 40.

The square root of 55551478 is about 7453.2863892380. The cubic root of 55551478 is about 381.5620786842.

The spelling of 55551478 in words is "fifty-five million, five hundred fifty-one thousand, four hundred seventy-eight".