51305916 has 48 divisors (see below), whose sum is σ = 125653248. Its totient is φ = 16262400.

The previous prime is 51305897. The next prime is 51305921. The reversal of 51305916 is 61950315.

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, 57796 + ... + 58676.

It is an arithmetic number, because the mean of its divisors is an integer number (2617776).

Almost surely, 2^51305916 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 51305916, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62826624).

51305916 is an abundant number, since it is smaller than the sum of its proper divisors (74347332).

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

51305916 is a wasteful number, since it uses less digits than its factorization.

51305916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1122 (or 1120 counting only the distinct ones).

The product of its (nonzero) digits is 4050, while the sum is 30.

The square root of 51305916 is about 7162.8148098356. The cubic root of 51305916 is about 371.5829816436.

The spelling of 51305916 in words is "fifty-one million, three hundred five thousand, nine hundred sixteen".