51204540 has 48 divisors (see below), whose sum is σ = 144230688. Its totient is φ = 13572864.

The previous prime is 51204533. The next prime is 51204541. The reversal of 51204540 is 4540215.

51204540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×51204540² = 5243809833223200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51204541) 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 15 ways as a sum of consecutive naturals, for example, 7914 + ... + 12846.

It is an arithmetic number, because the mean of its divisors is an integer number (3004806).

Almost surely, 2^51204540 is an apocalyptic number.

It is an amenable number.

51204540 is an abundant number, since it is smaller than the sum of its proper divisors (93026148).

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

51204540 is a wasteful number, since it uses less digits than its factorization.

51204540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5118 (or 5116 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 51204540 is about 7155.7347631113. The cubic root of 51204540 is about 371.3380817882.

Adding to 51204540 its reverse (4540215), we get a palindrome (55744755).

The spelling of 51204540 in words is "fifty-one million, two hundred four thousand, five hundred forty".