55143478 has 16 divisors (see below), whose sum is σ = 94318560. Its totient is φ = 23953536.

The previous prime is 55143467. The next prime is 55143481. The reversal of 55143478 is 87434155.

55143478 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 61938 + ... + 62821.

It is an arithmetic number, because the mean of its divisors is an integer number (5894910).

Almost surely, 2^55143478 is an apocalyptic number.

55143478 is a deficient number, since it is larger than the sum of its proper divisors (39175082).

55143478 is a wasteful number, since it uses less digits than its factorization.

55143478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124791.

The product of its digits is 67200, while the sum is 37.

The square root of 55143478 is about 7425.8654714451. The cubic root of 55143478 is about 380.6256498524.

The spelling of 55143478 in words is "fifty-five million, one hundred forty-three thousand, four hundred seventy-eight".