128699672 has 16 divisors (see below), whose sum is σ = 241591560. Its totient is φ = 64275264.

The previous prime is 128699671. The next prime is 128699687. The reversal of 128699672 is 276996821.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 128699672.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128699671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1613 + ... + 16124.

Almost surely, 2^128699672 is an apocalyptic number.

It is an amenable number.

128699672 is a deficient number, since it is larger than the sum of its proper divisors (112891888).

128699672 is a wasteful number, since it uses less digits than its factorization.

128699672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18650 (or 18646 counting only the distinct ones).

The product of its digits is 653184, while the sum is 50.

The square root of 128699672 is about 11344.5877844900. The cubic root of 128699672 is about 504.8850138489.

The spelling of 128699672 in words is "one hundred twenty-eight million, six hundred ninety-nine thousand, six hundred seventy-two".