51307828218 has 48 divisors (see below), whose sum is σ = 117174229536. Its totient is φ = 16822229040.

The previous prime is 51307828217. The next prime is 51307828259. The reversal of 51307828218 is 81282870315.

51307828218 is a `hidden beast` number, since 51 + 307 + 8 + 282 + 18 = 666.

It is not an unprimeable number, because it can be changed into a prime (51307828211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 835696 + ... + 894987.

It is an arithmetic number, because the mean of its divisors is an integer number (2441129782).

Almost surely, 2^51307828218 is an apocalyptic number.

51307828218 is an abundant number, since it is smaller than the sum of its proper divisors (65866401318).

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

51307828218 is a wasteful number, since it uses less digits than its factorization.

51307828218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1730761 (or 1730749 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 45.

The spelling of 51307828218 in words is "fifty-one billion, three hundred seven million, eight hundred twenty-eight thousand, two hundred eighteen".