55320000 has 140 divisors (see below), whose sum is σ = 183297576. Its totient is φ = 14720000.

The previous prime is 55319983. The next prime is 55320011. The reversal of 55320000 is 2355.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a nialpdrome in base 10.

It is a congruent number.

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 119770 + ... + 120230.

Almost surely, 2^55320000 is an apocalyptic number.

55320000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55320000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91648788).

55320000 is an abundant number, since it is smaller than the sum of its proper divisors (127977576).

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

55320000 is an equidigital number, since it uses as much as digits as its factorization.

55320000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 496 (or 471 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 15.

The square root of 55320000 is about 7437.7415927148. The cubic root of 55320000 is about 381.0313625921.

Adding to 55320000 its reverse (2355), we get a palindrome (55322355).

The spelling of 55320000 in words is "fifty-five million, three hundred twenty thousand".