51198156728 has 16 divisors (see below), whose sum is σ = 96011190000. Its totient is φ = 25595172736.

The previous prime is 51198156727. The next prime is 51198156761. The reversal of 51198156728 is 82765189115.

It is a self number, because there is not a number n which added to its sum of digits gives 51198156728.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51198156727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 432113 + ... + 537696.

It is an arithmetic number, because the mean of its divisors is an integer number (6000699375).

Almost surely, 2^51198156728 is an apocalyptic number.

It is an amenable number.

51198156728 is a deficient number, since it is larger than the sum of its proper divisors (44813033272).

51198156728 is a wasteful number, since it uses less digits than its factorization.

51198156728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 976414 (or 976410 counting only the distinct ones).

The product of its digits is 1209600, while the sum is 53.

The spelling of 51198156728 in words is "fifty-one billion, one hundred ninety-eight million, one hundred fifty-six thousand, seven hundred twenty-eight".