51310320 has 80 divisors (see below), whose sum is σ = 159751680. Its totient is φ = 13623552.

The previous prime is 51310291. The next prime is 51310331. The reversal of 51310320 is 2301315.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 51310320.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 105117 + ... + 105603.

It is an arithmetic number, because the mean of its divisors is an integer number (1996896).

Almost surely, 2^51310320 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 51310320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79875840).

51310320 is an abundant number, since it is smaller than the sum of its proper divisors (108441360).

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

51310320 is a wasteful number, since it uses less digits than its factorization.

51310320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 942 (or 936 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 15.

The square root of 51310320 is about 7163.1222242818. The cubic root of 51310320 is about 371.5936133261.

Adding to 51310320 its reverse (2301315), we get a palindrome (53611635).

The spelling of 51310320 in words is "fifty-one million, three hundred ten thousand, three hundred twenty".