55818487 has 4 divisors (see below), whose sum is σ = 56871720. Its totient is φ = 54765256.

The previous prime is 55818473. The next prime is 55818541. The reversal of 55818487 is 78481855.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55818487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55818407) 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 3 ways as a sum of consecutive naturals, for example, 526537 + ... + 526642.

It is an arithmetic number, because the mean of its divisors is an integer number (14217930).

Almost surely, 2^55818487 is an apocalyptic number.

55818487 is a deficient number, since it is larger than the sum of its proper divisors (1053233).

55818487 is a wasteful number, since it uses less digits than its factorization.

55818487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1053232.

The product of its digits is 358400, while the sum is 46.

The square root of 55818487 is about 7471.1770826289. The cubic root of 55818487 is about 382.1724297625.

It can be divided in two parts, 5581848 and 7, that added together give a palindrome (5581855).

The spelling of 55818487 in words is "fifty-five million, eight hundred eighteen thousand, four hundred eighty-seven".