51278025240 has 384 divisors, whose sum is σ = 186949002240. Its totient is φ = 12566140416.

The previous prime is 51278025229. The next prime is 51278025241. The reversal of 51278025240 is 4252087215.

It is a happy number.

51278025240 is a `hidden beast` number, since 5 + 127 + 8 + 0 + 2 + 524 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 51278025195 and 51278025204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51278025241) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 33231909 + ... + 33233451.

It is an arithmetic number, because the mean of its divisors is an integer number (486846360).

Almost surely, 2^51278025240 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 51278025240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93474501120).

51278025240 is an abundant number, since it is smaller than the sum of its proper divisors (135670977000).

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

51278025240 is a wasteful number, since it uses less digits than its factorization.

51278025240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1845 (or 1829 counting only the distinct ones).

The product of its (nonzero) digits is 44800, while the sum is 36.

The spelling of 51278025240 in words is "fifty-one billion, two hundred seventy-eight million, twenty-five thousand, two hundred forty".