51556224 has 128 divisors (see below), whose sum is σ = 145704960. Its totient is φ = 16128000.

The previous prime is 51556217. The next prime is 51556231. The reversal of 51556224 is 42265515.

It is an interprime number because it is at equal distance from previous prime (51556217) and next prime (51556231).

It is a tau number, because it is divible by the number of its divisors (128).

It is a junction number, because it is equal to n+sod(n) for n = 51556191 and 51556200.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 726109 + ... + 726179.

It is an arithmetic number, because the mean of its divisors is an integer number (1138320).

Almost surely, 2^51556224 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51556224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72852480).

51556224 is an abundant number, since it is smaller than the sum of its proper divisors (94148736).

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

51556224 is a wasteful number, since it uses less digits than its factorization.

51556224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180 (or 168 counting only the distinct ones).

The product of its digits is 12000, while the sum is 30.

The square root of 51556224 is about 7180.2662903266. The cubic root of 51556224 is about 372.1862866259.

The spelling of 51556224 in words is "fifty-one million, five hundred fifty-six thousand, two hundred twenty-four".