128669499 has 32 divisors (see below), whose sum is σ = 224890880. Its totient is φ = 71150400.

The previous prime is 128669479. The next prime is 128669509. The reversal of 128669499 is 994966821.

128669499 is a `hidden beast` number, since 12 + 86 + 69 + 499 = 666.

It is not a de Polignac number, because 128669499 - 2⁹ = 128668987 is a prime.

It is a super-2 number, since 2×128669499² = 33111679945822002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128669449) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5122 + ... + 16839.

It is an arithmetic number, because the mean of its divisors is an integer number (7027840).

Almost surely, 2^128669499 is an apocalyptic number.

128669499 is a deficient number, since it is larger than the sum of its proper divisors (96221381).

128669499 is a wasteful number, since it uses less digits than its factorization.

128669499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22008 (or 22002 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 54.

The square root of 128669499 is about 11343.2578653577. The cubic root of 128669499 is about 504.8455548357.

The spelling of 128669499 in words is "one hundred twenty-eight million, six hundred sixty-nine thousand, four hundred ninety-nine".