55403689 has 16 divisors (see below), whose sum is σ = 62479296. Its totient is φ = 48686400.

The previous prime is 55403687. The next prime is 55403701. The reversal of 55403689 is 98630455.

55403689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 55403689 - 2¹ = 55403687 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55403683) 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, 79834 + ... + 80524.

It is an arithmetic number, because the mean of its divisors is an integer number (3904956).

Almost surely, 2^55403689 is an apocalyptic number.

It is an amenable number.

55403689 is a deficient number, since it is larger than the sum of its proper divisors (7075607).

55403689 is a wasteful number, since it uses less digits than its factorization.

55403689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 936.

The product of its (nonzero) digits is 129600, while the sum is 40.

The square root of 55403689 is about 7443.3654350703. The cubic root of 55403689 is about 381.2234092715.

It can be divided in two parts, 5540 and 3689, that added together give a palindrome (9229).

The spelling of 55403689 in words is "fifty-five million, four hundred three thousand, six hundred eighty-nine".