128436816 has 40 divisors (see below), whose sum is σ = 332200960. Its totient is φ = 42759936.

The previous prime is 128436809. The next prime is 128436851. The reversal of 128436816 is 618634821.

It is a nude number because it is divisible by every one of its digits.

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, 76401 + ... + 78063.

It is an arithmetic number, because the mean of its divisors is an integer number (8305024).

Almost surely, 2^128436816 is an apocalyptic number.

128436816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

128436816 is an abundant number, since it is smaller than the sum of its proper divisors (203764144).

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

128436816 is a wasteful number, since it uses less digits than its factorization.

128436816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3283 (or 3277 counting only the distinct ones).

The product of its digits is 55296, while the sum is 39.

The square root of 128436816 is about 11332.9967793166. The cubic root of 128436816 is about 504.5410541323.

The spelling of 128436816 in words is "one hundred twenty-eight million, four hundred thirty-six thousand, eight hundred sixteen".