56688889 has 4 divisors (see below), whose sum is σ = 56776356. Its totient is φ = 56601424.

The previous prime is 56688871. The next prime is 56688893. The reversal of 56688889 is 98888665.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98888665 = 5 ⋅19777733.

It can be written as a sum of positive squares in 2 ways, for example, as 26625600 + 30063289 = 5160^2 + 5483^2 .

It is a cyclic number.

It is not a de Polignac number, because 56688889 - 2⁹ = 56688377 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (56688869) 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, 42754 + ... + 44059.

It is an arithmetic number, because the mean of its divisors is an integer number (14194089).

Almost surely, 2^56688889 is an apocalyptic number.

It is an amenable number.

56688889 is a deficient number, since it is larger than the sum of its proper divisors (87467).

56688889 is an equidigital number, since it uses as much as digits as its factorization.

56688889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87466.

The product of its digits is 6635520, while the sum is 58.

The square root of 56688889 is about 7529.2024145988. The cubic root of 56688889 is about 384.1486534740.

The spelling of 56688889 in words is "fifty-six million, six hundred eighty-eight thousand, eight hundred eighty-nine".