640189127 has 8 divisors (see below), whose sum is σ = 645415056. Its totient is φ = 634983552.

The previous prime is 640189073. The next prime is 640189171. The reversal of 640189127 is 721981046.

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

It is a cyclic number.

It is not a de Polignac number, because 640189127 - 2¹⁰ = 640188103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640189177) 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, 61568 + ... + 71210.

It is an arithmetic number, because the mean of its divisors is an integer number (80676882).

Almost surely, 2^640189127 is an apocalyptic number.

640189127 is a deficient number, since it is larger than the sum of its proper divisors (5225929).

640189127 is a wasteful number, since it uses less digits than its factorization.

640189127 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10177.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 640189127 is about 25301.9589557805. The cubic root of 640189127 is about 861.8587555210.

The spelling of 640189127 in words is "six hundred forty million, one hundred eighty-nine thousand, one hundred twenty-seven".