128630889236 has 6 divisors (see below), whose sum is σ = 225104056170. Its totient is φ = 64315444616.

The previous prime is 128630889229. The next prime is 128630889241. The reversal of 128630889236 is 632988036821.

It can be written as a sum of positive squares in only one way, i.e., 68065679236 + 60565210000 = 260894^2 + 246100^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16078861151 + ... + 16078861158.

It is an arithmetic number, because the mean of its divisors is an integer number (37517342695).

Almost surely, 2^128630889236 is an apocalyptic number.

It is an amenable number.

128630889236 is a deficient number, since it is larger than the sum of its proper divisors (96473166934).

128630889236 is a wasteful number, since it uses less digits than its factorization.

128630889236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32157722313 (or 32157722311 counting only the distinct ones).

The product of its (nonzero) digits is 5971968, while the sum is 56.

The spelling of 128630889236 in words is "one hundred twenty-eight billion, six hundred thirty million, eight hundred eighty-nine thousand, two hundred thirty-six".