51224400 has 360 divisors, whose sum is σ = 201487104. Its totient is φ = 12441600.

The previous prime is 51224389. The next prime is 51224429. The reversal of 51224400 is 442215.

51224400 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (360).

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 71 ways as a sum of consecutive naturals, for example, 1652385 + ... + 1652415.

Almost surely, 2^51224400 is an apocalyptic number.

51224400 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 51224400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100743552).

51224400 is an abundant number, since it is smaller than the sum of its proper divisors (150262704).

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

51224400 is a wasteful number, since it uses less digits than its factorization.

51224400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81 (or 58 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 51224400 is about 7157.1223267456. The cubic root of 51224400 is about 371.3860841793.

Adding to 51224400 its reverse (442215), we get a palindrome (51666615).

The spelling of 51224400 in words is "fifty-one million, two hundred twenty-four thousand, four hundred".