128213712 has 80 divisors (see below), whose sum is σ = 401492160. Its totient is φ = 38851200.

The previous prime is 128213693. The next prime is 128213741. The reversal of 128213712 is 217312821.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8739 + ... + 18242.

It is an arithmetic number, because the mean of its divisors is an integer number (5018652).

Almost surely, 2^128213712 is an apocalyptic number.

128213712 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

128213712 is an abundant number, since it is smaller than the sum of its proper divisors (273278448).

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

128213712 is a wasteful number, since it uses less digits than its factorization.

128213712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27009 (or 26997 counting only the distinct ones).

The product of its digits is 1344, while the sum is 27.

The square root of 128213712 is about 11323.1493852196. The cubic root of 128213712 is about 504.2487434285.

The spelling of 128213712 in words is "one hundred twenty-eight million, two hundred thirteen thousand, seven hundred twelve".