128640143 has 8 divisors (see below), whose sum is σ = 134952480. Its totient is φ = 122452960.

The previous prime is 128640137. The next prime is 128640151. The reversal of 128640143 is 341046821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128640143 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128640163) 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, 29180 + ... + 33297.

It is an arithmetic number, because the mean of its divisors is an integer number (16869060).

Almost surely, 2^128640143 is an apocalyptic number.

128640143 is a deficient number, since it is larger than the sum of its proper divisors (6312337).

128640143 is an equidigital number, since it uses as much as digits as its factorization.

128640143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62577.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 128640143 is about 11341.9638070309. The cubic root of 128640143 is about 504.8071583407.

Adding to 128640143 its reverse (341046821), we get a palindrome (469686964).

The spelling of 128640143 in words is "one hundred twenty-eight million, six hundred forty thousand, one hundred forty-three".