128684764 has 36 divisors (see below), whose sum is σ = 257656504. Its totient is φ = 55892736.

The previous prime is 128684761. The next prime is 128684789. The reversal of 128684764 is 467486821.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128684761) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10747 + ... + 19309.

Almost surely, 2^128684764 is an apocalyptic number.

It is an amenable number.

128684764 is an abundant number, since it is smaller than the sum of its proper divisors (128971740).

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

128684764 is a wasteful number, since it uses less digits than its factorization.

128684764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8614 (or 8595 counting only the distinct ones).

The product of its digits is 516096, while the sum is 46.

The square root of 128684764 is about 11343.9307120592. The cubic root of 128684764 is about 504.8655185482.

The spelling of 128684764 in words is "one hundred twenty-eight million, six hundred eighty-four thousand, seven hundred sixty-four".