640001602 has 4 divisors (see below), whose sum is σ = 960002406. Its totient is φ = 320000800.

The previous prime is 640001591. The next prime is 640001627. The reversal of 640001602 is 206100046.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 206100046 = 2 ⋅103050023.

It can be written as a sum of positive squares in only one way, i.e., 600299001 + 39702601 = 24501^2 + 6301^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 640001602.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160000399 + ... + 160000402.

Almost surely, 2^640001602 is an apocalyptic number.

640001602 is a deficient number, since it is larger than the sum of its proper divisors (320000804).

640001602 is a wasteful number, since it uses less digits than its factorization.

640001602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320000803.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 640001602 is about 25298.2529436323. The cubic root of 640001602 is about 861.7745950547.

Adding to 640001602 its reverse (206100046), we get a palindrome (846101648).

The spelling of 640001602 in words is "six hundred forty million, one thousand, six hundred two".