51729643782 has 48 divisors (see below), whose sum is σ = 112816634112. Its totient is φ = 17130144240.

The previous prime is 51729643769. The next prime is 51729643783. The reversal of 51729643782 is 28734692715.

It is a happy number.

51729643782 is a `hidden beast` number, since 51 + 72 + 96 + 437 + 8 + 2 = 666.

It is a super-2 number, since 2×51729643782² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51729643783) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6810807 + ... + 6818397.

It is an arithmetic number, because the mean of its divisors is an integer number (2350346544).

Almost surely, 2^51729643782 is an apocalyptic number.

51729643782 is an abundant number, since it is smaller than the sum of its proper divisors (61086990330).

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

51729643782 is a wasteful number, since it uses less digits than its factorization.

51729643782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10033 (or 10030 counting only the distinct ones).

The product of its digits is 5080320, while the sum is 54.

The spelling of 51729643782 in words is "fifty-one billion, seven hundred twenty-nine million, six hundred forty-three thousand, seven hundred eighty-two".