128402836 has 96 divisors (see below), whose sum is σ = 272160000. Its totient is φ = 52512768.

The previous prime is 128402831. The next prime is 128402843. The reversal of 128402836 is 638204821.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128402831) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 861690 + ... + 861838.

It is an arithmetic number, because the mean of its divisors is an integer number (2835000).

Almost surely, 2^128402836 is an apocalyptic number.

It is an amenable number.

128402836 is an abundant number, since it is smaller than the sum of its proper divisors (143757164).

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

128402836 is a wasteful number, since it uses less digits than its factorization.

128402836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241 (or 239 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 34.

The square root of 128402836 is about 11331.4975179806. The cubic root of 128402836 is about 504.4965554241.

The spelling of 128402836 in words is "one hundred twenty-eight million, four hundred two thousand, eight hundred thirty-six".