51550520 has 64 divisors (see below), whose sum is σ = 136857600. Its totient is φ = 17101440.

The previous prime is 51550517. The next prime is 51550529. The reversal of 51550520 is 2505515.

It is a super-3 number, since 3×51550520³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51550529) by changing a digit.

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, 5711 + ... + 11649.

It is an arithmetic number, because the mean of its divisors is an integer number (2138400).

Almost surely, 2^51550520 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 51550520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68428800).

51550520 is an abundant number, since it is smaller than the sum of its proper divisors (85307080).

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

51550520 is a wasteful number, since it uses less digits than its factorization.

51550520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5988 (or 5984 counting only the distinct ones).

The product of its (nonzero) digits is 1250, while the sum is 23.

The square root of 51550520 is about 7179.8690795863. The cubic root of 51550520 is about 372.1725603241.

The spelling of 51550520 in words is "fifty-one million, five hundred fifty thousand, five hundred twenty".