128878813 has 8 divisors (see below), whose sum is σ = 152369280. Its totient is φ = 106658160.

The previous prime is 128878801. The next prime is 128878817. The reversal of 128878813 is 318878821.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128878813 - 2⁹ = 128878301 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128878817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 317233 + ... + 317638.

It is an arithmetic number, because the mean of its divisors is an integer number (19046160).

Almost surely, 2^128878813 is an apocalyptic number.

It is an amenable number.

128878813 is a deficient number, since it is larger than the sum of its proper divisors (23490467).

128878813 is an equidigital number, since it uses as much as digits as its factorization.

128878813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 634907.

The product of its digits is 172032, while the sum is 46.

The square root of 128878813 is about 11352.4804778515. The cubic root of 128878813 is about 505.1191601955.

The spelling of 128878813 in words is "one hundred twenty-eight million, eight hundred seventy-eight thousand, eight hundred thirteen".