128945816 has 32 divisors (see below), whose sum is σ = 261455040. Its totient is φ = 59386368.

The previous prime is 128945743. The next prime is 128945821. The reversal of 128945816 is 618549821.

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, 3695 + ... + 16478.

It is an arithmetic number, because the mean of its divisors is an integer number (8170470).

Almost surely, 2^128945816 is an apocalyptic number.

It is an amenable number.

128945816 is an abundant number, since it is smaller than the sum of its proper divisors (132509224).

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

128945816 is a wasteful number, since it uses less digits than its factorization.

128945816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20243 (or 20239 counting only the distinct ones).

The product of its digits is 138240, while the sum is 44.

The square root of 128945816 is about 11355.4311234757. The cubic root of 128945816 is about 505.2066807503.

The spelling of 128945816 in words is "one hundred twenty-eight million, nine hundred forty-five thousand, eight hundred sixteen".