128487660 has 192 divisors, whose sum is σ = 439713792. Its totient is φ = 27396864.

The previous prime is 128487647. The next prime is 128487673. The reversal of 128487660 is 66784821.

It is an interprime number because it is at equal distance from previous prime (128487647) and next prime (128487673).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 453879 + ... + 454161.

It is an arithmetic number, because the mean of its divisors is an integer number (2290176).

Almost surely, 2^128487660 is an apocalyptic number.

128487660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128487660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (219856896).

128487660 is an abundant number, since it is smaller than the sum of its proper divisors (311226132).

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

128487660 is a wasteful number, since it uses less digits than its factorization.

128487660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372 (or 370 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 128487660 is about 11335.2397416199. The cubic root of 128487660 is about 504.6076225349.

The spelling of 128487660 in words is "one hundred twenty-eight million, four hundred eighty-seven thousand, six hundred sixty".