128973669 has 16 divisors (see below), whose sum is σ = 188205120. Its totient is φ = 77912960.

The previous prime is 128973631. The next prime is 128973683. The reversal of 128973669 is 966379821.

It is a cyclic number.

It is not a de Polignac number, because 128973669 - 2²¹ = 126876517 is a prime.

It is a super-2 number, since 2×128973669² = 33268414590643122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128971669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4297 + ... + 16625.

It is an arithmetic number, because the mean of its divisors is an integer number (11762820).

Almost surely, 2^128973669 is an apocalyptic number.

It is an amenable number.

128973669 is a deficient number, since it is larger than the sum of its proper divisors (59231451).

128973669 is a wasteful number, since it uses less digits than its factorization.

128973669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12660.

The product of its digits is 979776, while the sum is 51.

The square root of 128973669 is about 11356.6574748031. The cubic root of 128973669 is about 505.2430539316.

The spelling of 128973669 in words is "one hundred twenty-eight million, nine hundred seventy-three thousand, six hundred sixty-nine".