640507095 has 20 divisors (see below), whose sum is σ = 1148169000. Its totient is φ = 341603568.

The previous prime is 640507073. The next prime is 640507097. The reversal of 640507095 is 590705046.

640507095 is a `hidden beast` number, since 64 + 0 + 507 + 0 + 95 = 666.

It is not a de Polignac number, because 640507095 - 2¹⁹ = 639982807 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640507097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 790345 + ... + 791154.

It is an arithmetic number, because the mean of its divisors is an integer number (57408450).

Almost surely, 2^640507095 is an apocalyptic number.

640507095 is a deficient number, since it is larger than the sum of its proper divisors (507661905).

640507095 is a wasteful number, since it uses less digits than its factorization.

640507095 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1581516 (or 1581507 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 36.

The square root of 640507095 is about 25308.2416418051. The cubic root of 640507095 is about 862.0014207300.

The spelling of 640507095 in words is "six hundred forty million, five hundred seven thousand, ninety-five".