55247550 has 48 divisors (see below), whose sum is σ = 137870640. Its totient is φ = 14640640.

The previous prime is 55247531. The next prime is 55247557. The reversal of 55247550 is 5574255.

55247550 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55247557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24886 + ... + 27014.

It is an arithmetic number, because the mean of its divisors is an integer number (2872305).

Almost surely, 2^55247550 is an apocalyptic number.

55247550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 55247550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68935320).

55247550 is an abundant number, since it is smaller than the sum of its proper divisors (82623090).

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

55247550 is a wasteful number, since it uses less digits than its factorization.

55247550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2317 (or 2312 counting only the distinct ones).

The product of its (nonzero) digits is 35000, while the sum is 33.

The square root of 55247550 is about 7432.8695669977. The cubic root of 55247550 is about 380.8649503102.

The spelling of 55247550 in words is "fifty-five million, two hundred forty-seven thousand, five hundred fifty".