55588889 has 4 divisors (see below), whose sum is σ = 58514640. Its totient is φ = 52663140.

The previous prime is 55588867. The next prime is 55588913. The reversal of 55588889 is 98888555.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98888555 = 5 ⋅19777711.

It is a cyclic number.

It is not a de Polignac number, because 55588889 - 2⁸ = 55588633 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 (55588189) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1462847 + ... + 1462884.

It is an arithmetic number, because the mean of its divisors is an integer number (14628660).

Almost surely, 2^55588889 is an apocalyptic number.

It is an amenable number.

55588889 is a deficient number, since it is larger than the sum of its proper divisors (2925751).

55588889 is a wasteful number, since it uses less digits than its factorization.

55588889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2925750.

The product of its digits is 4608000, while the sum is 56.

The square root of 55588889 is about 7455.7956651185. The cubic root of 55588889 is about 381.6477134638.

The spelling of 55588889 in words is "fifty-five million, five hundred eighty-eight thousand, eight hundred eighty-nine".