51236310540 has 96 divisors (see below), whose sum is σ = 152062868160. Its totient is φ = 12845572096.

The previous prime is 51236310533. The next prime is 51236310553. The reversal of 51236310540 is 4501363215.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 51236310498 and 51236310507.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 945706 + ... + 998414.

It is an arithmetic number, because the mean of its divisors is an integer number (1583988210).

Almost surely, 2^51236310540 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51236310540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76031434080).

51236310540 is an abundant number, since it is smaller than the sum of its proper divisors (100826557620).

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

51236310540 is a wasteful number, since it uses less digits than its factorization.

51236310540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53691 (or 53689 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 30.

Adding to 51236310540 its reverse (4501363215), we get a palindrome (55737673755).

The spelling of 51236310540 in words is "fifty-one billion, two hundred thirty-six million, three hundred ten thousand, five hundred forty".