640471535 has 8 divisors (see below), whose sum is σ = 838435536. Its totient is φ = 465797440.

The previous prime is 640471529. The next prime is 640471567. The reversal of 640471535 is 535174046.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 640471535 - 2⁴ = 640471519 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 640471495 and 640471504.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 5822414 + ... + 5822523.

It is an arithmetic number, because the mean of its divisors is an integer number (104804442).

Almost surely, 2^640471535 is an apocalyptic number.

640471535 is a deficient number, since it is larger than the sum of its proper divisors (197964001).

640471535 is a wasteful number, since it uses less digits than its factorization.

640471535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11644953.

The product of its (nonzero) digits is 50400, while the sum is 35.

The square root of 640471535 is about 25307.5390941119. The cubic root of 640471535 is about 861.9854680898.

The spelling of 640471535 in words is "six hundred forty million, four hundred seventy-one thousand, five hundred thirty-five".