640682602 has 32 divisors (see below), whose sum is σ = 1143516672. Its totient is φ = 263481984.

The previous prime is 640682599. The next prime is 640682633. The reversal of 640682602 is 206286046.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29343 + ... + 46285.

It is an arithmetic number, because the mean of its divisors is an integer number (35734896).

Almost surely, 2^640682602 is an apocalyptic number.

640682602 is a deficient number, since it is larger than the sum of its proper divisors (502834070).

640682602 is a wasteful number, since it uses less digits than its factorization.

640682602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17062.

The product of its (nonzero) digits is 27648, while the sum is 34.

The square root of 640682602 is about 25311.7087925727. The cubic root of 640682602 is about 862.0801466169.

The spelling of 640682602 in words is "six hundred forty million, six hundred eighty-two thousand, six hundred two".