128697678 has 96 divisors (see below), whose sum is σ = 309504000. Its totient is φ = 38491200.

The previous prime is 128697677. The next prime is 128697683. The reversal of 128697678 is 876796821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128697671) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 646623 + ... + 646821.

It is an arithmetic number, because the mean of its divisors is an integer number (3224000).

Almost surely, 2^128697678 is an apocalyptic number.

128697678 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 128697678, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (154752000).

128697678 is an abundant number, since it is smaller than the sum of its proper divisors (180806322).

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

128697678 is a wasteful number, since it uses less digits than its factorization.

128697678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318 (or 315 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 54.

The square root of 128697678 is about 11344.4999008330. The cubic root of 128697678 is about 504.8824063678.

The spelling of 128697678 in words is "one hundred twenty-eight million, six hundred ninety-seven thousand, six hundred seventy-eight".