128815944 has 32 divisors (see below), whose sum is σ = 330745920. Its totient is φ = 41777856.

The previous prime is 128815937. The next prime is 128815963. The reversal of 128815944 is 449518821.

It is a super-2 number, since 2×128815944² = 33187094857222272, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 128815896 and 128815905.

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, 71644 + ... + 73419.

It is an arithmetic number, because the mean of its divisors is an integer number (10335810).

Almost surely, 2^128815944 is an apocalyptic number.

It is an amenable number.

128815944 is an abundant number, since it is smaller than the sum of its proper divisors (201929976).

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

128815944 is a wasteful number, since it uses less digits than its factorization.

128815944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145109 (or 145105 counting only the distinct ones).

The product of its digits is 92160, while the sum is 42.

The square root of 128815944 is about 11349.7111857527. The cubic root of 128815944 is about 505.0370119591.

The spelling of 128815944 in words is "one hundred twenty-eight million, eight hundred fifteen thousand, nine hundred forty-four".