128863669 has 6 divisors (see below), whose sum is σ = 141643670. Its totient is φ = 117148680.

The previous prime is 128863663. The next prime is 128863717. The reversal of 128863669 is 966368821.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 76475025 + 52388644 = 8745^2 + 7238^2 .

It is not a de Polignac number, because 128863669 - 2³ = 128863661 is a prime.

It is a super-2 number, since 2×128863669² = 33211690376283122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128863661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 532374 + ... + 532615.

Almost surely, 2^128863669 is an apocalyptic number.

It is an amenable number.

128863669 is a deficient number, since it is larger than the sum of its proper divisors (12780001).

128863669 is a wasteful number, since it uses less digits than its factorization.

128863669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1065011 (or 1065000 counting only the distinct ones).

The product of its digits is 746496, while the sum is 49.

The square root of 128863669 is about 11351.8134674597. The cubic root of 128863669 is about 505.0993746207.

The spelling of 128863669 in words is "one hundred twenty-eight million, eight hundred sixty-three thousand, six hundred sixty-nine".