55012500 has 144 divisors (see below), whose sum is σ = 179363520. Its totient is φ = 14580000.

The previous prime is 55012453. The next prime is 55012511. The reversal of 55012500 is 521055.

55012500 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 337419 + ... + 337581.

It is an arithmetic number, because the mean of its divisors is an integer number (1245580).

Almost surely, 2^55012500 is an apocalyptic number.

55012500 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 55012500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89681760).

55012500 is an abundant number, since it is smaller than the sum of its proper divisors (124351020).

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

55012500 is a wasteful number, since it uses less digits than its factorization.

55012500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201 (or 173 counting only the distinct ones).

The product of its (nonzero) digits is 250, while the sum is 18.

The square root of 55012500 is about 7417.0411890457. The cubic root of 55012500 is about 380.3240541397.

Adding to 55012500 its reverse (521055), we get a palindrome (55533555).

It can be divided in two parts, 5501 and 2500, that added together give a triangular number (8001 = T₁₂₆).

The spelling of 55012500 in words is "fifty-five million, twelve thousand, five hundred".