51505340 has 24 divisors (see below), whose sum is σ = 108296160. Its totient is φ = 20576448.

The previous prime is 51505339. The next prime is 51505343. The reversal of 51505340 is 4350515.

51505340 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51505343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30026 + ... + 31694.

It is an arithmetic number, because the mean of its divisors is an integer number (4512340).

Almost surely, 2^51505340 is an apocalyptic number.

It is an amenable number.

51505340 is an abundant number, since it is smaller than the sum of its proper divisors (56790820).

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

51505340 is a wasteful number, since it uses less digits than its factorization.

51505340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3221 (or 3219 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 23.

The square root of 51505340 is about 7176.7220929892. The cubic root of 51505340 is about 372.0638018289.

Adding to 51505340 its reverse (4350515), we get a palindrome (55855855).

The spelling of 51505340 in words is "fifty-one million, five hundred five thousand, three hundred forty".