128691648 has 42 divisors (see below), whose sum is σ = 368873024. Its totient is φ = 42897024.

The previous prime is 128691623. The next prime is 128691659. The reversal of 128691648 is 846196821.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 111136 + ... + 112287.

Almost surely, 2^128691648 is an apocalyptic number.

128691648 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

128691648 is an abundant number, since it is smaller than the sum of its proper divisors (240181376).

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

128691648 is a wasteful number, since it uses less digits than its factorization.

128691648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223441 (or 223428 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 128691648 is about 11344.2341301650. The cubic root of 128691648 is about 504.8745209925.

The spelling of 128691648 in words is "one hundred twenty-eight million, six hundred ninety-one thousand, six hundred forty-eight".