55478890 has 32 divisors (see below), whose sum is σ = 102600576. Its totient is φ = 21591360.

The previous prime is 55478887. The next prime is 55478897. The reversal of 55478890 is 9887455.

55478890 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 55478890.

It is not an unprimeable number, because it can be changed into a prime (55478897) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 62389 + ... + 63271.

It is an arithmetic number, because the mean of its divisors is an integer number (3206268).

Almost surely, 2^55478890 is an apocalyptic number.

55478890 is a deficient number, since it is larger than the sum of its proper divisors (47121686).

55478890 is a wasteful number, since it uses less digits than its factorization.

55478890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1054.

The product of its (nonzero) digits is 403200, while the sum is 46.

The square root of 55478890 is about 7448.4152676929. The cubic root of 55478890 is about 381.3958130776.

The spelling of 55478890 in words is "fifty-five million, four hundred seventy-eight thousand, eight hundred ninety".