128320880 has 40 divisors (see below), whose sum is σ = 298976400. Its totient is φ = 51219968.

The previous prime is 128320877. The next prime is 128320883. The reversal of 128320880 is 88023821.

It is an interprime number because it is at equal distance from previous prime (128320877) and next prime (128320883).

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128320883) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44111 + ... + 46929.

It is an arithmetic number, because the mean of its divisors is an integer number (7474410).

Almost surely, 2^128320880 is an apocalyptic number.

128320880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128320880 is an abundant number, since it is smaller than the sum of its proper divisors (170655520).

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

128320880 is a wasteful number, since it uses less digits than its factorization.

128320880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3401 (or 3395 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 128320880 is about 11327.8806490888. The cubic root of 128320880 is about 504.3891971526.

The spelling of 128320880 in words is "one hundred twenty-eight million, three hundred twenty thousand, eight hundred eighty".