51236560 has 20 divisors (see below), whose sum is σ = 119125188. Its totient is φ = 20494592.

The previous prime is 51236557. The next prime is 51236567. The reversal of 51236560 is 6563215.

51236560 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 19607184 + 31629376 = 4428^2 + 5624^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51236567) 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 3 ways as a sum of consecutive naturals, for example, 320149 + ... + 320308.

Almost surely, 2^51236560 is an apocalyptic number.

It is an amenable number.

51236560 is an abundant number, since it is smaller than the sum of its proper divisors (67888628).

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

51236560 is a wasteful number, since it uses less digits than its factorization.

51236560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640470 (or 640464 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 51236560 is about 7157.9717797711. The cubic root of 51236560 is about 371.4154692476.

Adding to 51236560 its reverse (6563215), we get a palindrome (57799775).

The spelling of 51236560 in words is "fifty-one million, two hundred thirty-six thousand, five hundred sixty".