640076517 has 6 divisors (see below), whose sum is σ = 924554982. Its totient is φ = 426717672.

The previous prime is 640076501. The next prime is 640076531. The reversal of 640076517 is 715670046.

640076517 is a `hidden beast` number, since 640 + 0 + 7 + 6 + 5 + 1 + 7 = 666.

640076517 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 411643521 + 228432996 = 20289^2 + 15114^2 .

It is not a de Polignac number, because 640076517 - 2⁴ = 640076501 is a prime.

It is a super-2 number, since 2×640076517² = 819395895229702578, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640076557) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35559798 + ... + 35559815.

It is an arithmetic number, because the mean of its divisors is an integer number (154092497).

Almost surely, 2^640076517 is an apocalyptic number.

It is an amenable number.

640076517 is a deficient number, since it is larger than the sum of its proper divisors (284478465).

640076517 is a wasteful number, since it uses less digits than its factorization.

640076517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71119619 (or 71119616 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The square root of 640076517 is about 25299.7335361462. The cubic root of 640076517 is about 861.8082185773.

The spelling of 640076517 in words is "six hundred forty million, seventy-six thousand, five hundred seventeen".