51987947064 has 64 divisors (see below), whose sum is σ = 132700377600. Its totient is φ = 16968946176.

The previous prime is 51987947021. The next prime is 51987947071. The reversal of 51987947064 is 46074978915.

It is a junction number, because it is equal to n+sod(n) for n = 51987946989 and 51987947007.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109617 + ... + 340575.

It is an arithmetic number, because the mean of its divisors is an integer number (2073443400).

Almost surely, 2^51987947064 is an apocalyptic number.

It is an amenable number.

51987947064 is an abundant number, since it is smaller than the sum of its proper divisors (80712430536).

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

51987947064 is a wasteful number, since it uses less digits than its factorization.

51987947064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231164 (or 231160 counting only the distinct ones).

The product of its (nonzero) digits is 15240960, while the sum is 60.

The spelling of 51987947064 in words is "fifty-one billion, nine hundred eighty-seven million, nine hundred forty-seven thousand, sixty-four".