128738764 has 24 divisors (see below), whose sum is σ = 280885248. Its totient is φ = 50157840.

The previous prime is 128738759. The next prime is 128738777. The reversal of 128738764 is 467837821.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 208684 + ... + 209299.

It is an arithmetic number, because the mean of its divisors is an integer number (11703552).

Almost surely, 2^128738764 is an apocalyptic number.

128738764 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

128738764 is an abundant number, since it is smaller than the sum of its proper divisors (152146484).

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

128738764 is a wasteful number, since it uses less digits than its factorization.

128738764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418005 (or 418003 counting only the distinct ones).

The product of its digits is 451584, while the sum is 46.

The square root of 128738764 is about 11346.3105897909. The cubic root of 128738764 is about 504.9361275947.

The spelling of 128738764 in words is "one hundred twenty-eight million, seven hundred thirty-eight thousand, seven hundred sixty-four".