128716992 has 56 divisors (see below), whose sum is σ = 378409200. Its totient is φ = 42905088.

The previous prime is 128716967. The next prime is 128716997. The reversal of 128716992 is 299617821.

It is not an unprimeable number, because it can be changed into a prime (128716997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35517 + ... + 38972.

Almost surely, 2^128716992 is an apocalyptic number.

128716992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

128716992 is an abundant number, since it is smaller than the sum of its proper divisors (249692208).

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

128716992 is an equidigital number, since it uses as much as digits as its factorization.

128716992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74510 (or 74494 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 128716992 is about 11345.3511184097. The cubic root of 128716992 is about 504.9076614492.

The spelling of 128716992 in words is "one hundred twenty-eight million, seven hundred sixteen thousand, nine hundred ninety-two".