640212476 has 6 divisors (see below), whose sum is σ = 1120371840. Its totient is φ = 320106236.

The previous prime is 640212473. The next prime is 640212533. The reversal of 640212476 is 674212046.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640212473) 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 as a sum of consecutive naturals, namely, 80026556 + ... + 80026563.

It is an arithmetic number, because the mean of its divisors is an integer number (186728640).

Almost surely, 2^640212476 is an apocalyptic number.

It is an amenable number.

640212476 is a deficient number, since it is larger than the sum of its proper divisors (480159364).

640212476 is a wasteful number, since it uses less digits than its factorization.

640212476 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160053123 (or 160053121 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 640212476 is about 25302.4203585349. The cubic root of 640212476 is about 861.8692333078.

The spelling of 640212476 in words is "six hundred forty million, two hundred twelve thousand, four hundred seventy-six".