128713216 has 20 divisors (see below), whose sum is σ = 257176062. Its totient is φ = 64356352.

The previous prime is 128713177. The next prime is 128713237. The reversal of 128713216 is 612317821.

It can be written as a sum of positive squares in only one way, i.e., 114575616 + 14137600 = 10704^2 + 3760^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125185 + ... + 126208.

Almost surely, 2^128713216 is an apocalyptic number.

128713216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

128713216 is a deficient number, since it is larger than the sum of its proper divisors (128462846).

128713216 is an frugal number, since it uses more digits than its factorization.

128713216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251411 (or 251395 counting only the distinct ones).

The product of its digits is 4032, while the sum is 31.

The square root of 128713216 is about 11345.1847054158. The cubic root of 128713216 is about 504.9027241317.

The spelling of 128713216 in words is "one hundred twenty-eight million, seven hundred thirteen thousand, two hundred sixteen".