128678419 has 8 divisors (see below), whose sum is σ = 129754368. Its totient is φ = 127607040.

The previous prime is 128678387. The next prime is 128678441. The reversal of 128678419 is 914876821.

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

It is a cyclic number.

It is not a de Polignac number, because 128678419 - 2⁵ = 128678387 is a prime.

It is a super-2 number, since 2×128678419² = 33116271032679122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128678449) 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, 74979 + ... + 76675.

It is an arithmetic number, because the mean of its divisors is an integer number (16219296).

Almost surely, 2^128678419 is an apocalyptic number.

128678419 is a deficient number, since it is larger than the sum of its proper divisors (1075949).

128678419 is a wasteful number, since it uses less digits than its factorization.

128678419 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2285.

The product of its digits is 193536, while the sum is 46.

The square root of 128678419 is about 11343.6510436455. The cubic root of 128678419 is about 504.8572206885.

The spelling of 128678419 in words is "one hundred twenty-eight million, six hundred seventy-eight thousand, four hundred nineteen".