128487669 has 8 divisors (see below), whose sum is σ = 171381312. Its totient is φ = 85626240.

The previous prime is 128487647. The next prime is 128487673. The reversal of 128487669 is 966784821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128487669 - 2⁸ = 128487413 is a prime.

It is a super-2 number, since 2×128487669² = 33018162170107122, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128487169) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3712 + ... + 16454.

It is an arithmetic number, because the mean of its divisors is an integer number (21422664).

Almost surely, 2^128487669 is an apocalyptic number.

It is an amenable number.

128487669 is a deficient number, since it is larger than the sum of its proper divisors (42893643).

128487669 is a wasteful number, since it uses less digits than its factorization.

128487669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16107.

The product of its digits is 1161216, while the sum is 51.

The square root of 128487669 is about 11335.2401386120. The cubic root of 128487669 is about 504.6076343168.

The spelling of 128487669 in words is "one hundred twenty-eight million, four hundred eighty-seven thousand, six hundred sixty-nine".