51536320 has 84 divisors (see below), whose sum is σ = 134992872. Its totient is φ = 18740480.

The previous prime is 51536297. The next prime is 51536357. The reversal of 51536320 is 2363515.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4685115 + ... + 4685125.

It is an arithmetic number, because the mean of its divisors is an integer number (1607058).

Almost surely, 2^51536320 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 51536320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67496436).

51536320 is an abundant number, since it is smaller than the sum of its proper divisors (83456552).

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

51536320 is an frugal number, since it uses more digits than its factorization.

51536320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72 (or 18 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 25.

The square root of 51536320 is about 7178.8801355086. The cubic root of 51536320 is about 372.1383845571.

Adding to 51536320 its reverse (2363515), we get a palindrome (53899835).

The spelling of 51536320 in words is "fifty-one million, five hundred thirty-six thousand, three hundred twenty".