128449678 has 24 divisors (see below), whose sum is σ = 231367104. Its totient is φ = 53272800.

The previous prime is 128449669. The next prime is 128449723. The reversal of 128449678 is 876944821.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18103 + ... + 24178.

It is an arithmetic number, because the mean of its divisors is an integer number (9640296).

Almost surely, 2^128449678 is an apocalyptic number.

128449678 is a deficient number, since it is larger than the sum of its proper divisors (102917426).

128449678 is a wasteful number, since it uses less digits than its factorization.

128449678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42328 (or 42321 counting only the distinct ones).

The product of its digits is 774144, while the sum is 49.

The square root of 128449678 is about 11333.5642231383. The cubic root of 128449678 is about 504.5578955921.

It can be divided in two parts, 12844 and 9678, that added together give a palindrome (22522).

The spelling of 128449678 in words is "one hundred twenty-eight million, four hundred forty-nine thousand, six hundred seventy-eight".