51240050440 has 128 divisors (see below), whose sum is σ = 129581337600. Its totient is φ = 18140855040.

The previous prime is 51240050431. The next prime is 51240050441. The reversal of 51240050440 is 4405004215.

It is a happy number.

51240050440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (51240050441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 717555 + ... + 785725.

It is an arithmetic number, because the mean of its divisors is an integer number (1012354200).

Almost surely, 2^51240050440 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 51240050440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64790668800).

51240050440 is an abundant number, since it is smaller than the sum of its proper divisors (78341287160).

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

51240050440 is a wasteful number, since it uses less digits than its factorization.

51240050440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68267 (or 68263 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 25.

Adding to 51240050440 its reverse (4405004215), we get a palindrome (55645054655).

The spelling of 51240050440 in words is "fifty-one billion, two hundred forty million, fifty thousand, four hundred forty".