128978708 has 6 divisors (see below), whose sum is σ = 225712746. Its totient is φ = 64489352.

The previous prime is 128978701. The next prime is 128978723. The reversal of 128978708 is 807879821.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 101646724 + 27331984 = 10082^2 + 5228^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128978701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16122335 + ... + 16122342.

It is an arithmetic number, because the mean of its divisors is an integer number (37618791).

Almost surely, 2^128978708 is an apocalyptic number.

It is an amenable number.

128978708 is a deficient number, since it is larger than the sum of its proper divisors (96734038).

128978708 is a wasteful number, since it uses less digits than its factorization.

128978708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32244681 (or 32244679 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 50.

The square root of 128978708 is about 11356.8793248850. The cubic root of 128978708 is about 505.2496337930.

It can be divided in two parts, 1289 and 78708, that added together give a palindrome (79997).

The spelling of 128978708 in words is "one hundred twenty-eight million, nine hundred seventy-eight thousand, seven hundred eight".