128478313 has 2 divisors, whose sum is σ = 128478314. Its totient is φ = 128478312.

The previous prime is 128478283. The next prime is 128478349. The reversal of 128478313 is 313874821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 111239209 + 17239104 = 10547^2 + 4152^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128478313 is a prime.

It is a super-2 number, since 2×128478313² = 33013353822651938, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (128478113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64239156 + 64239157.

It is an arithmetic number, because the mean of its divisors is an integer number (64239157).

Almost surely, 2^128478313 is an apocalyptic number.

It is an amenable number.

128478313 is a deficient number, since it is larger than the sum of its proper divisors (1).

128478313 is an equidigital number, since it uses as much as digits as its factorization.

128478313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32256, while the sum is 37.

The square root of 128478313 is about 11334.8274358280. The cubic root of 128478313 is about 504.5953861281.

It can be divided in two parts, 1284 and 78313, that added together give a palindrome (79597).

The spelling of 128478313 in words is "one hundred twenty-eight million, four hundred seventy-eight thousand, three hundred thirteen".