128886320 has 20 divisors (see below), whose sum is σ = 299660880. Its totient is φ = 51554496.

The previous prime is 128886293. The next prime is 128886337. The reversal of 128886320 is 23688821.

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×128886320² = 33223366966284800, which contains 22 as substring.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 805460 + ... + 805619.

It is an arithmetic number, because the mean of its divisors is an integer number (14983044).

Almost surely, 2^128886320 is an apocalyptic number.

128886320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128886320 is an abundant number, since it is smaller than the sum of its proper divisors (170774560).

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

128886320 is a wasteful number, since it uses less digits than its factorization.

128886320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1611092 (or 1611086 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 38.

The square root of 128886320 is about 11352.8111056249. The cubic root of 128886320 is about 505.1289674861.

The spelling of 128886320 in words is "one hundred twenty-eight million, eight hundred eighty-six thousand, three hundred twenty".