51728334220 has 24 divisors (see below), whose sum is σ = 108687764304. Its totient is φ = 20680236096.

The previous prime is 51728334199. The next prime is 51728334223. The reversal of 51728334220 is 2243382715.

It is a super-2 number, since 2×51728334220² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51728334220.

It is not an unprimeable number, because it can be changed into a prime (51728334223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 655327 + ... + 730006.

It is an arithmetic number, because the mean of its divisors is an integer number (4528656846).

Almost surely, 2^51728334220 is an apocalyptic number.

It is an amenable number.

51728334220 is an abundant number, since it is smaller than the sum of its proper divisors (56959430084).

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

51728334220 is a wasteful number, since it uses less digits than its factorization.

51728334220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1387209 (or 1387207 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 37.

The spelling of 51728334220 in words is "fifty-one billion, seven hundred twenty-eight million, three hundred thirty-four thousand, two hundred twenty".