128717712 has 30 divisors (see below), whose sum is σ = 360231222. Its totient is φ = 42905856.

The previous prime is 128717711. The next prime is 128717741. The reversal of 128717712 is 217717821.

It can be written as a sum of positive squares in only one way, i.e., 128051856 + 665856 = 11316^2 + 816^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (128717711) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 446793 + ... + 447080.

Almost surely, 2^128717712 is an apocalyptic number.

128717712 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

128717712 is an abundant number, since it is smaller than the sum of its proper divisors (231513510).

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

128717712 is a wasteful number, since it uses less digits than its factorization.

128717712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 893887 (or 893878 counting only the distinct ones).

The product of its digits is 10976, while the sum is 36.

The square root of 128717712 is about 11345.3828494238. The cubic root of 128717712 is about 504.9086028759.

The spelling of 128717712 in words is "one hundred twenty-eight million, seven hundred seventeen thousand, seven hundred twelve".