51508320 has 48 divisors (see below), whose sum is σ = 162252720. Its totient is φ = 13735424.

The previous prime is 51508319. The next prime is 51508349. The reversal of 51508320 is 2380515.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (24).

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 7 ways as a sum of consecutive naturals, for example, 53175 + ... + 54134.

It is an arithmetic number, because the mean of its divisors is an integer number (3380265).

Almost surely, 2^51508320 is an apocalyptic number.

It is an amenable number.

51508320 is an abundant number, since it is smaller than the sum of its proper divisors (110744400).

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

51508320 is a wasteful number, since it uses less digits than its factorization.

51508320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107327 (or 107319 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 51508320 is about 7176.9297056610. The cubic root of 51508320 is about 372.0709773227.

Adding to 51508320 its reverse (2380515), we get a palindrome (53888835).

The spelling of 51508320 in words is "fifty-one million, five hundred eight thousand, three hundred twenty".