128392816 has 20 divisors (see below), whose sum is σ = 251227224. Its totient is φ = 63560000.

The previous prime is 128392813. The next prime is 128392819. The reversal of 128392816 is 618293821.

It is an interprime number because it is at equal distance from previous prime (128392813) and next prime (128392819).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128392811) 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, 38110 + ... + 41341.

Almost surely, 2^128392816 is an apocalyptic number.

128392816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

128392816 is a deficient number, since it is larger than the sum of its proper divisors (122834408).

128392816 is a wasteful number, since it uses less digits than its factorization.

128392816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79560 (or 79554 counting only the distinct ones).

The product of its digits is 41472, while the sum is 40.

The square root of 128392816 is about 11331.0553789133. The cubic root of 128392816 is about 504.4834321756.

The spelling of 128392816 in words is "one hundred twenty-eight million, three hundred ninety-two thousand, eight hundred sixteen".