128612193940 has 12 divisors (see below), whose sum is σ = 270085607316. Its totient is φ = 51444877568.

The previous prime is 128612193923. The next prime is 128612193953. The reversal of 128612193940 is 49391216821.

It can be written as a sum of positive squares in 2 ways, for example, as 33904593424 + 94707600516 = 184132^2 + 307746^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3215304829 + ... + 3215304868.

It is an arithmetic number, because the mean of its divisors is an integer number (22507133943).

Almost surely, 2^128612193940 is an apocalyptic number.

128612193940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128612193940 is an abundant number, since it is smaller than the sum of its proper divisors (141473413376).

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

128612193940 is a wasteful number, since it uses less digits than its factorization.

128612193940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6430609706 (or 6430609704 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 46.

The spelling of 128612193940 in words is "one hundred twenty-eight billion, six hundred twelve million, one hundred ninety-three thousand, nine hundred forty".