128403236 has 24 divisors (see below), whose sum is σ = 242308920. Its totient is φ = 59185152.

The previous prime is 128403229. The next prime is 128403251. The reversal of 128403236 is 632304821.

It can be written as a sum of positive squares in 4 ways, for example, as 25502500 + 102900736 = 5050^2 + 10144^2 .

It is a junction number, because it is equal to n+sod(n) for n = 128403199 and 128403208.

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, 62270 + ... + 64298.

It is an arithmetic number, because the mean of its divisors is an integer number (10096205).

Almost surely, 2^128403236 is an apocalyptic number.

It is an amenable number.

128403236 is a deficient number, since it is larger than the sum of its proper divisors (113905684).

128403236 is a wasteful number, since it uses less digits than its factorization.

128403236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3263 (or 3261 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 128403236 is about 11331.5151678847. The cubic root of 128403236 is about 504.4970792921.

The spelling of 128403236 in words is "one hundred twenty-eight million, four hundred three thousand, two hundred thirty-six".