128961210 has 32 divisors (see below), whose sum is σ = 353722752. Its totient is φ = 29476800.

The previous prime is 128961191. The next prime is 128961221. The reversal of 128961210 is 12169821.

It is a happy number.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 306841 + ... + 307260.

It is an arithmetic number, because the mean of its divisors is an integer number (11053836).

Almost surely, 2^128961210 is an apocalyptic number.

128961210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128961210 is an abundant number, since it is smaller than the sum of its proper divisors (224761542).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128961210 is a wasteful number, since it uses less digits than its factorization.

128961210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 614118.

The product of its (nonzero) digits is 1728, while the sum is 30.

The square root of 128961210 is about 11356.1089286780. The cubic root of 128961210 is about 505.2267843939.

The spelling of 128961210 in words is "one hundred twenty-eight million, nine hundred sixty-one thousand, two hundred ten".