128791264 has 48 divisors (see below), whose sum is σ = 290618496. Its totient is φ = 55036800.

The previous prime is 128791249. The next prime is 128791301. The reversal of 128791264 is 462197821.

It is a congruent number.

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, 109399 + ... + 110569.

It is an arithmetic number, because the mean of its divisors is an integer number (6054552).

Almost surely, 2^128791264 is an apocalyptic number.

128791264 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 128791264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (145309248).

128791264 is an abundant number, since it is smaller than the sum of its proper divisors (161827232).

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

128791264 is a wasteful number, since it uses less digits than its factorization.

128791264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1679 (or 1671 counting only the distinct ones).

The product of its digits is 48384, while the sum is 40.

The square root of 128791264 is about 11348.6238813347. The cubic root of 128791264 is about 505.0047563516.

The spelling of 128791264 in words is "one hundred twenty-eight million, seven hundred ninety-one thousand, two hundred sixty-four".