51401240730 has 192 divisors, whose sum is σ = 156383136000. Its totient is φ = 11470970880.

The previous prime is 51401240711. The next prime is 51401240741. The reversal of 51401240730 is 3704210415.

It is a junction number, because it is equal to n+sod(n) for n = 51401240694 and 51401240703.

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 95 ways as a sum of consecutive naturals, for example, 5533690 + ... + 5542970.

It is an arithmetic number, because the mean of its divisors is an integer number (814495500).

Almost surely, 2^51401240730 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51401240730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78191568000).

51401240730 is an abundant number, since it is smaller than the sum of its proper divisors (104981895270).

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

51401240730 is a wasteful number, since it uses less digits than its factorization.

51401240730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9509 (or 9506 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The spelling of 51401240730 in words is "fifty-one billion, four hundred one million, two hundred forty thousand, seven hundred thirty".