128229766 has 12 divisors (see below), whose sum is σ = 223748028. Its totient is φ = 54955572.

The previous prime is 128229749. The next prime is 128229767. The reversal of 128229766 is 667922821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128229767) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 654136 + ... + 654331.

It is an arithmetic number, because the mean of its divisors is an integer number (18645669).

Almost surely, 2^128229766 is an apocalyptic number.

128229766 is a deficient number, since it is larger than the sum of its proper divisors (95518262).

128229766 is a wasteful number, since it uses less digits than its factorization.

128229766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1308483 (or 1308476 counting only the distinct ones).

The product of its digits is 145152, while the sum is 43.

The square root of 128229766 is about 11323.8582647435. The cubic root of 128229766 is about 504.2697886853.

The spelling of 128229766 in words is "one hundred twenty-eight million, two hundred twenty-nine thousand, seven hundred sixty-six".