128321560 has 16 divisors (see below), whose sum is σ = 288723600. Its totient is φ = 51328608.

The previous prime is 128321551. The next prime is 128321597. The reversal of 128321560 is 65123821.

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, 1603980 + ... + 1604059.

It is an arithmetic number, because the mean of its divisors is an integer number (18045225).

Almost surely, 2^128321560 is an apocalyptic number.

128321560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128321560 is an abundant number, since it is smaller than the sum of its proper divisors (160402040).

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

128321560 is a wasteful number, since it uses less digits than its factorization.

128321560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3208050 (or 3208046 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 128321560 is about 11327.9106634895. The cubic root of 128321560 is about 504.3900881067.

It can be divided in two parts, 128321 and 560, that added together give a square (128881 = 359²).

The spelling of 128321560 in words is "one hundred twenty-eight million, three hundred twenty-one thousand, five hundred sixty".