640327235 has 16 divisors (see below), whose sum is σ = 773102880. Its totient is φ = 509134080.

The previous prime is 640327157. The next prime is 640327243. The reversal of 640327235 is 532723046.

It is not a de Polignac number, because 640327235 - 2¹⁴ = 640310851 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 971336 + ... + 971994.

It is an arithmetic number, because the mean of its divisors is an integer number (48318930).

Almost surely, 2^640327235 is an apocalyptic number.

640327235 is a deficient number, since it is larger than the sum of its proper divisors (132775645).

640327235 is a wasteful number, since it uses less digits than its factorization.

640327235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1558.

The product of its (nonzero) digits is 30240, while the sum is 32.

The square root of 640327235 is about 25304.6880043995. The cubic root of 640327235 is about 861.9207273278.

The spelling of 640327235 in words is "six hundred forty million, three hundred twenty-seven thousand, two hundred thirty-five".