128431128 has 32 divisors (see below), whose sum is σ = 366946560. Its totient is φ = 36694560.

The previous prime is 128431117. The next prime is 128431139. The reversal of 128431128 is 821134821.

It is an interprime number because it is at equal distance from previous prime (128431117) and next prime (128431139).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 128431095 and 128431104.

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, 382068 + ... + 382403.

It is an arithmetic number, because the mean of its divisors is an integer number (11467080).

Almost surely, 2^128431128 is an apocalyptic number.

It is an amenable number.

128431128 is an abundant number, since it is smaller than the sum of its proper divisors (238515432).

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

128431128 is a wasteful number, since it uses less digits than its factorization.

128431128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 764487 (or 764483 counting only the distinct ones).

The product of its digits is 3072, while the sum is 30.

The square root of 128431128 is about 11332.7458279095. The cubic root of 128431128 is about 504.5336059255.

Adding to 128431128 its reverse (821134821), we get a palindrome (949565949).

The spelling of 128431128 in words is "one hundred twenty-eight million, four hundred thirty-one thousand, one hundred twenty-eight".