640162 has 4 divisors (see below), whose sum is σ = 960246. Its totient is φ = 320080.

The previous prime is 640153. The next prime is 640163. The reversal of 640162 is 261046.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 261046 = 2 ⋅130523.

It can be written as a sum of positive squares in only one way, i.e., 516961 + 123201 = 719^2 + 351^2 .

It is not an unprimeable number, because it can be changed into a prime (640163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160039 + ... + 160042.

2⁶⁴⁰¹⁶² is an apocalyptic number.

640162 is a deficient number, since it is larger than the sum of its proper divisors (320084).

640162 is a wasteful number, since it uses less digits than its factorization.

640162 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320083.

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

The square root of 640162 is about 800.1012435936. The cubic root of 640162 is about 86.1846582049.

The spelling of 640162 in words is "six hundred forty thousand, one hundred sixty-two".