640042602 has 8 divisors (see below), whose sum is σ = 1280085216. Its totient is φ = 213347532.

The previous prime is 640042589. The next prime is 640042633. The reversal of 640042602 is 206240046.

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

640042602 is an admirable number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 53336878 + ... + 53336889.

It is an arithmetic number, because the mean of its divisors is an integer number (160010652).

Almost surely, 2^640042602 is an apocalyptic number.

640042602 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

640042602 is a wasteful number, since it uses less digits than its factorization.

640042602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106673772.

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 640042602 is about 25299.0632632910. The cubic root of 640042602 is about 861.7929970940.

Adding to 640042602 its reverse (206240046), we get a palindrome (846282648).

The spelling of 640042602 in words is "six hundred forty million, forty-two thousand, six hundred two".