55616789 has 4 divisors (see below), whose sum is σ = 55645740. Its totient is φ = 55587840.

The previous prime is 55616777. The next prime is 55616791. The reversal of 55616789 is 98761655.

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

It can be written as a sum of positive squares in 2 ways, for example, as 25421764 + 30195025 = 5042^2 + 5495^2 .

It is a cyclic number.

It is not a de Polignac number, because 55616789 - 2¹² = 55612693 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55616389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11372 + ... + 15509.

It is an arithmetic number, because the mean of its divisors is an integer number (13911435).

Almost surely, 2^55616789 is an apocalyptic number.

It is an amenable number.

55616789 is a deficient number, since it is larger than the sum of its proper divisors (28951).

55616789 is a wasteful number, since it uses less digits than its factorization.

55616789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28950.

The product of its digits is 453600, while the sum is 47.

The square root of 55616789 is about 7457.6664580819. Note that the first 3 decimals coincide. The cubic root of 55616789 is about 381.7115523022.

The spelling of 55616789 in words is "fifty-five million, six hundred sixteen thousand, seven hundred eighty-nine".