128621166 has 16 divisors (see below), whose sum is σ = 258681600. Its totient is φ = 42633848.

The previous prime is 128621159. The next prime is 128621179. The reversal of 128621166 is 661126821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58806 + ... + 60953.

It is an arithmetic number, because the mean of its divisors is an integer number (16167600).

Almost surely, 2^128621166 is an apocalyptic number.

128621166 is an abundant number, since it is smaller than the sum of its proper divisors (130060434).

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

128621166 is a wasteful number, since it uses less digits than its factorization.

128621166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119943.

The product of its digits is 6912, while the sum is 33.

The square root of 128621166 is about 11341.1271926559. The cubic root of 128621166 is about 504.7823340613.

Adding to 128621166 its reverse (661126821), we get a palindrome (789747987).

It can be divided in two parts, 12862 and 1166, that added together give a triangular number (14028 = T₁₆₇).

The spelling of 128621166 in words is "one hundred twenty-eight million, six hundred twenty-one thousand, one hundred sixty-six".