128788313 has 4 divisors (see below), whose sum is σ = 128898000. Its totient is φ = 128678628.

The previous prime is 128788307. The next prime is 128788337. The reversal of 128788313 is 313887821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 313887821 = 13 ⋅24145217.

It is a cyclic number.

It is not a de Polignac number, because 128788313 - 2¹² = 128784217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128788393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53063 + ... + 55436.

It is an arithmetic number, because the mean of its divisors is an integer number (32224500).

Almost surely, 2^128788313 is an apocalyptic number.

It is an amenable number.

128788313 is a deficient number, since it is larger than the sum of its proper divisors (109687).

128788313 is a wasteful number, since it uses less digits than its factorization.

128788313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109686.

The product of its digits is 64512, while the sum is 41.

The square root of 128788313 is about 11348.4938648263. The cubic root of 128788313 is about 505.0008992566. Note that the first 3 decimals are identical.

The spelling of 128788313 in words is "one hundred twenty-eight million, seven hundred eighty-eight thousand, three hundred thirteen".