640417127 has 32 divisors (see below), whose sum is σ = 786100224. Its totient is φ = 510636960.

The previous prime is 640417117. The next prime is 640417139. The reversal of 640417127 is 721714046.

It is not a de Polignac number, because 640417127 - 2⁸ = 640416871 is a prime.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 640417093 and 640417102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640417117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7715828 + ... + 7715910.

It is an arithmetic number, because the mean of its divisors is an integer number (24565632).

Almost surely, 2^640417127 is an apocalyptic number.

640417127 is a deficient number, since it is larger than the sum of its proper divisors (145683097).

640417127 is an frugal number, since it uses more digits than its factorization.

640417127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220 (or 158 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 640417127 is about 25306.4641346831. The cubic root of 640417127 is about 861.9610588689.

The spelling of 640417127 in words is "six hundred forty million, four hundred seventeen thousand, one hundred twenty-seven".