128878764 has 48 divisors (see below), whose sum is σ = 347558400. Its totient is φ = 36406656.

The previous prime is 128878709. The next prime is 128878769. The reversal of 128878764 is 467878821.

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (128878769) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1144 + ... + 16095.

It is an arithmetic number, because the mean of its divisors is an integer number (7240800).

Almost surely, 2^128878764 is an apocalyptic number.

128878764 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128878764, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (173779200).

128878764 is an abundant number, since it is smaller than the sum of its proper divisors (218679636).

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

128878764 is a wasteful number, since it uses less digits than its factorization.

128878764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17342 (or 17340 counting only the distinct ones).

The product of its digits is 1204224, while the sum is 51.

The square root of 128878764 is about 11352.4783197327. The cubic root of 128878764 is about 505.1190961797.

The spelling of 128878764 in words is "one hundred twenty-eight million, eight hundred seventy-eight thousand, seven hundred sixty-four".