51489342240 has 384 divisors, whose sum is σ = 195850690560. Its totient is φ = 11120406528.

The previous prime is 51489342169. The next prime is 51489342241. The reversal of 51489342240 is 4224398415.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 51489342192 and 51489342201.

It is not an unprimeable number, because it can be changed into a prime (51489342241) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4574059 + ... + 4585301.

It is an arithmetic number, because the mean of its divisors is an integer number (510027840).

Almost surely, 2^51489342240 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 51489342240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97925345280).

51489342240 is an abundant number, since it is smaller than the sum of its proper divisors (144361348320).

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

51489342240 is a wasteful number, since it uses less digits than its factorization.

51489342240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11344 (or 11336 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 42.

The spelling of 51489342240 in words is "fifty-one billion, four hundred eighty-nine million, three hundred forty-two thousand, two hundred forty".