640715463 has 12 divisors (see below), whose sum is σ = 942940440. Its totient is φ = 419084016.

The previous prime is 640715461. The next prime is 640715477. The reversal of 640715463 is 364517046.

It is a happy number.

640715463 is a `hidden beast` number, since 6 + 40 + 71 + 546 + 3 = 666.

It is not a de Polignac number, because 640715463 - 2¹ = 640715461 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640715461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 671133 + ... + 672086.

It is an arithmetic number, because the mean of its divisors is an integer number (78578370).

Almost surely, 2^640715463 is an apocalyptic number.

640715463 is a deficient number, since it is larger than the sum of its proper divisors (302224977).

640715463 is a wasteful number, since it uses less digits than its factorization.

640715463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1343278 (or 1343275 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The square root of 640715463 is about 25312.3579107123. The cubic root of 640715463 is about 862.0948852364.

The spelling of 640715463 in words is "six hundred forty million, seven hundred fifteen thousand, four hundred sixty-three".