55215475 has 12 divisors (see below), whose sum is σ = 78248464. Its totient is φ = 37861920.

The previous prime is 55215467. The next prime is 55215491. The reversal of 55215475 is 57451255.

55215475 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 55215475 - 2³ = 55215467 is a prime.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 55215475.

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 11 ways as a sum of consecutive naturals, for example, 157584 + ... + 157933.

Almost surely, 2^55215475 is an apocalyptic number.

55215475 is a deficient number, since it is larger than the sum of its proper divisors (23032989).

55215475 is a wasteful number, since it uses less digits than its factorization.

55215475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315534 (or 315529 counting only the distinct ones).

The product of its digits is 35000, while the sum is 34.

The square root of 55215475 is about 7430.7116079148. The cubic root of 55215475 is about 380.7912299482.

The spelling of 55215475 in words is "fifty-five million, two hundred fifteen thousand, four hundred seventy-five".