640371127 has 8 divisors (see below), whose sum is σ = 722676240. Its totient is φ = 562080960.

The previous prime is 640371101. The next prime is 640371143. The reversal of 640371127 is 721173046.

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 640371127 - 2¹⁵ = 640338359 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640371227) 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, 1003398 + ... + 1004035.

It is an arithmetic number, because the mean of its divisors is an integer number (90334530).

Almost surely, 2^640371127 is an apocalyptic number.

640371127 is a deficient number, since it is larger than the sum of its proper divisors (82305113).

640371127 is a wasteful number, since it uses less digits than its factorization.

640371127 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2007473.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 640371127 is about 25305.5552596658. Note that the first 3 decimals coincide. The cubic root of 640371127 is about 861.9404206753.

The spelling of 640371127 in words is "six hundred forty million, three hundred seventy-one thousand, one hundred twenty-seven".