128270198650 has 24 divisors (see below), whose sum is σ = 260271895104. Its totient is φ = 46643708400.

The previous prime is 128270198629. The next prime is 128270198663. The reversal of 128270198650 is 56891072821.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 128270198594 and 128270198603.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 116608722 + ... + 116609821.

It is an arithmetic number, because the mean of its divisors is an integer number (10844662296).

Almost surely, 2^128270198650 is an apocalyptic number.

128270198650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128270198650 is an abundant number, since it is smaller than the sum of its proper divisors (132001696454).

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

128270198650 is a wasteful number, since it uses less digits than its factorization.

128270198650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233218566 (or 233218561 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 49.

The spelling of 128270198650 in words is "one hundred twenty-eight billion, two hundred seventy million, one hundred ninety-eight thousand, six hundred fifty".