128401660 has 24 divisors (see below), whose sum is σ = 271063296. Its totient is φ = 51090240.

The previous prime is 128401657. The next prime is 128401661. The reversal of 128401660 is 66104821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128401661) 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, 12987 + ... + 20626.

It is an arithmetic number, because the mean of its divisors is an integer number (11294304).

Almost surely, 2^128401660 is an apocalyptic number.

128401660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128401660 is an abundant number, since it is smaller than the sum of its proper divisors (142661636).

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

128401660 is a wasteful number, since it uses less digits than its factorization.

128401660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33813 (or 33811 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 128401660 is about 11331.4456271034. The cubic root of 128401660 is about 504.4950152459.

The spelling of 128401660 in words is "one hundred twenty-eight million, four hundred one thousand, six hundred sixty".