51847028640 has 768 divisors, whose sum is σ = 204002426880. Its totient is φ = 12294374400.

The previous prime is 51847028609. The next prime is 51847028657. The reversal of 51847028640 is 4682074815.

51847028640 is a `hidden beast` number, since 518 + 4 + 70 + 2 + 8 + 64 + 0 = 666.

It is a super-2 number, since 2×51847028640² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 408244257 + ... + 408244383.

It is an arithmetic number, because the mean of its divisors is an integer number (265628160).

Almost surely, 2^51847028640 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 51847028640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102001213440).

51847028640 is an abundant number, since it is smaller than the sum of its proper divisors (152155398240).

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

51847028640 is a wasteful number, since it uses less digits than its factorization.

51847028640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255 (or 219 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 45.

The spelling of 51847028640 in words is "fifty-one billion, eight hundred forty-seven million, twenty-eight thousand, six hundred forty".