640180467 has 12 divisors (see below), whose sum is σ = 944380320. Its totient is φ = 417706128.

The previous prime is 640180451. The next prime is 640180469. The reversal of 640180467 is 764081046.

640180467 is a `hidden beast` number, since 640 + 1 + 8 + 0 + 4 + 6 + 7 = 666.

It is not a de Polignac number, because 640180467 - 2⁴ = 640180451 is a prime.

It is not an unprimeable number, because it can be changed into a prime (640180469) 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, 756292 + ... + 757137.

It is an arithmetic number, because the mean of its divisors is an integer number (78698360).

Almost surely, 2^640180467 is an apocalyptic number.

640180467 is a deficient number, since it is larger than the sum of its proper divisors (304199853).

640180467 is a wasteful number, since it uses less digits than its factorization.

640180467 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1513482 (or 1513479 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 640180467 is about 25301.7878222073. The cubic root of 640180467 is about 861.8548693098.

It can be divided in two parts, 6401 and 80467, that added together give a palindrome (86868).

The spelling of 640180467 in words is "six hundred forty million, one hundred eighty thousand, four hundred sixty-seven".