128650 has 24 divisors (see below), whose sum is σ = 249984. Its totient is φ = 49200.

The previous prime is 128629. The next prime is 128657. The reversal of 128650 is 56821.

It is a happy number.

It is a hoax number, since the sum of its digits (22) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (128657) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1509 + ... + 1591.

It is an arithmetic number, because the mean of its divisors is an integer number (10416).

2¹²⁸⁶⁵⁰ is an apocalyptic number.

128650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128650 is a deficient number, since it is larger than the sum of its proper divisors (121334).

128650 is a wasteful number, since it uses less digits than its factorization.

128650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126 (or 121 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 128650 is about 358.6781286892. The cubic root of 128650 is about 50.4820051561.

The spelling of 128650 in words is "one hundred twenty-eight thousand, six hundred fifty".