128678772 has 24 divisors (see below), whose sum is σ = 301679392. Its totient is φ = 42688800.

The previous prime is 128678761. The next prime is 128678777. The reversal of 128678772 is 277876821.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128678777) 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, 22879 + ... + 27942.

Almost surely, 2^128678772 is an apocalyptic number.

128678772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

128678772 is an abundant number, since it is smaller than the sum of its proper divisors (173000620).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128678772 is a wasteful number, since it uses less digits than its factorization.

128678772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51039 (or 51037 counting only the distinct ones).

The product of its digits is 526848, while the sum is 48.

The square root of 128678772 is about 11343.6666029992. Note that the first 4 decimals coincide. The cubic root of 128678772 is about 504.8576823417.

The spelling of 128678772 in words is "one hundred twenty-eight million, six hundred seventy-eight thousand, seven hundred seventy-two".