128639775246 has 16 divisors (see below), whose sum is σ = 260803928784. Its totient is φ = 42292528704.

The previous prime is 128639775221. The next prime is 128639775259. The reversal of 128639775246 is 642577936821.

It is a self number, because there is not a number n which added to its sum of digits gives 128639775246.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 146848621 + ... + 146849496.

It is an arithmetic number, because the mean of its divisors is an integer number (16300245549).

Almost surely, 2^128639775246 is an apocalyptic number.

128639775246 is an abundant number, since it is smaller than the sum of its proper divisors (132164153538).

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

128639775246 is a wasteful number, since it uses less digits than its factorization.

128639775246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293698195.

The product of its digits is 30481920, while the sum is 60.

The spelling of 128639775246 in words is "one hundred twenty-eight billion, six hundred thirty-nine million, seven hundred seventy-five thousand, two hundred forty-six".