640575476 has 12 divisors (see below), whose sum is σ = 1137739008. Its totient is φ = 315507192.

The previous prime is 640575473. The next prime is 640575499. The reversal of 640575476 is 674575046.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640575473) 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 3 ways as a sum of consecutive naturals, for example, 1194836 + ... + 1195371.

It is an arithmetic number, because the mean of its divisors is an integer number (94811584).

Almost surely, 2^640575476 is an apocalyptic number.

It is an amenable number.

640575476 is a deficient number, since it is larger than the sum of its proper divisors (497163532).

640575476 is a wasteful number, since it uses less digits than its factorization.

640575476 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2390278 (or 2390276 counting only the distinct ones).

The product of its (nonzero) digits is 705600, while the sum is 44.

The square root of 640575476 is about 25309.5925688265. The cubic root of 640575476 is about 862.0320956032.

The spelling of 640575476 in words is "six hundred forty million, five hundred seventy-five thousand, four hundred seventy-six".