128315816 has 16 divisors (see below), whose sum is σ = 253255200. Its totient is φ = 60781104.

The previous prime is 128315777. The next prime is 128315819. The reversal of 128315816 is 618513821.

It is not an unprimeable number, because it can be changed into a prime (128315819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 421940 + ... + 422243.

It is an arithmetic number, because the mean of its divisors is an integer number (15828450).

Almost surely, 2^128315816 is an apocalyptic number.

It is an amenable number.

128315816 is a deficient number, since it is larger than the sum of its proper divisors (124939384).

128315816 is a wasteful number, since it uses less digits than its factorization.

128315816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 844208 (or 844204 counting only the distinct ones).

The product of its digits is 11520, while the sum is 35.

The square root of 128315816 is about 11327.6571275794. The cubic root of 128315816 is about 504.3825620659.

The spelling of 128315816 in words is "one hundred twenty-eight million, three hundred fifteen thousand, eight hundred sixteen".