51230540 has 12 divisors (see below), whose sum is σ = 107584176. Its totient is φ = 20492208.

The previous prime is 51230539. The next prime is 51230549. The reversal of 51230540 is 4503215.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 2561527 = 51230540 / (5 + 1 + 2 + 3 + 0 + 5 + 4 + 0).

It is not an unprimeable number, because it can be changed into a prime (51230549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1280744 + ... + 1280783.

It is an arithmetic number, because the mean of its divisors is an integer number (8965348).

Almost surely, 2^51230540 is an apocalyptic number.

It is an amenable number.

51230540 is an abundant number, since it is smaller than the sum of its proper divisors (56353636).

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

51230540 is a wasteful number, since it uses less digits than its factorization.

51230540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2561536 (or 2561534 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 51230540 is about 7157.5512572387. The cubic root of 51230540 is about 371.4009222867.

Adding to 51230540 its reverse (4503215), we get a palindrome (55733755).

The spelling of 51230540 in words is "fifty-one million, two hundred thirty thousand, five hundred forty".