128212747 has 16 divisors (see below), whose sum is σ = 140978880. Its totient is φ = 115886592.

The previous prime is 128212727. The next prime is 128212769. The reversal of 128212747 is 747212821.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 128212747 - 2⁷ = 128212619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128212727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 158079 + ... + 158887.

It is an arithmetic number, because the mean of its divisors is an integer number (8811180).

Almost surely, 2^128212747 is an apocalyptic number.

128212747 is a deficient number, since it is larger than the sum of its proper divisors (12766133).

128212747 is a wasteful number, since it uses less digits than its factorization.

128212747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1062.

The product of its digits is 12544, while the sum is 34.

The square root of 128212747 is about 11323.1067733198. The cubic root of 128212747 is about 504.2474783499.

The spelling of 128212747 in words is "one hundred twenty-eight million, two hundred twelve thousand, seven hundred forty-seven".