51550200 has 144 divisors (see below), whose sum is σ = 186524520. Its totient is φ = 12683520.

The previous prime is 51550183. The next prime is 51550201. The reversal of 51550200 is 205515.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51550201) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 22299 + ... + 24501.

Almost surely, 2^51550200 is an apocalyptic number.

51550200 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 51550200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93262260).

51550200 is an abundant number, since it is smaller than the sum of its proper divisors (134974320).

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

51550200 is a wasteful number, since it uses less digits than its factorization.

51550200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2238 (or 2226 counting only the distinct ones).

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

The square root of 51550200 is about 7179.8467950229. The cubic root of 51550200 is about 372.1717902351.

Adding to 51550200 its reverse (205515), we get a palindrome (51755715).

The spelling of 51550200 in words is "fifty-one million, five hundred fifty thousand, two hundred".