55389558 has 64 divisors (see below), whose sum is σ = 130636800. Its totient is φ = 15330432.

The previous prime is 55389557. The next prime is 55389559. The reversal of 55389558 is 85598355.

It is an interprime number because it is at equal distance from previous prime (55389557) and next prime (55389559).

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55389557) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 331591 + ... + 331757.

It is an arithmetic number, because the mean of its divisors is an integer number (2041200).

Almost surely, 2^55389558 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55389558, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65318400).

55389558 is an abundant number, since it is smaller than the sum of its proper divisors (75247242).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55389558 is a wasteful number, since it uses less digits than its factorization.

55389558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381.

The product of its digits is 1080000, while the sum is 48.

The square root of 55389558 is about 7442.4161399374. The cubic root of 55389558 is about 381.1909955089.

The spelling of 55389558 in words is "fifty-five million, three hundred eighty-nine thousand, five hundred fifty-eight".