55320550 has 48 divisors (see below), whose sum is σ = 111957120. Its totient is φ = 20252160.

The previous prime is 55320547. The next prime is 55320553. The reversal of 55320550 is 5502355.

It is an interprime number because it is at equal distance from previous prime (55320547) and next prime (55320553).

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55320553) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30571 + ... + 32329.

It is an arithmetic number, because the mean of its divisors is an integer number (2332440).

Almost surely, 2^55320550 is an apocalyptic number.

55320550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

55320550 is an abundant number, since it is smaller than the sum of its proper divisors (56636570).

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

55320550 is a wasteful number, since it uses less digits than its factorization.

55320550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1825 (or 1820 counting only the distinct ones).

The product of its (nonzero) digits is 3750, while the sum is 25.

The square root of 55320550 is about 7437.7785662118. The cubic root of 55320550 is about 381.0326253455.

The spelling of 55320550 in words is "fifty-five million, three hundred twenty thousand, five hundred fifty".