128405509630 has 32 divisors (see below), whose sum is σ = 236841770880. Its totient is φ = 50106195360.

The previous prime is 128405509627. The next prime is 128405509633. The reversal of 128405509630 is 36905504821.

128405509630 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (128405509627) and next prime (128405509633).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128405509633) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 753384 + ... + 907963.

It is an arithmetic number, because the mean of its divisors is an integer number (7401305340).

Almost surely, 2^128405509630 is an apocalyptic number.

128405509630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128405509630 is a deficient number, since it is larger than the sum of its proper divisors (108436261250).

128405509630 is a wasteful number, since it uses less digits than its factorization.

128405509630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1661544.

The product of its (nonzero) digits is 259200, while the sum is 43.

The spelling of 128405509630 in words is "one hundred twenty-eight billion, four hundred five million, five hundred nine thousand, six hundred thirty".