640630202 has 4 divisors (see below), whose sum is σ = 960945306. Its totient is φ = 320315100.

The previous prime is 640630187. The next prime is 640630223. The reversal of 640630202 is 202036046.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 202036046 = 2 ⋅101018023.

It can be written as a sum of positive squares in only one way, i.e., 366760801 + 273869401 = 19151^2 + 16549^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160157549 + ... + 160157552.

Almost surely, 2^640630202 is an apocalyptic number.

640630202 is a deficient number, since it is larger than the sum of its proper divisors (320315104).

640630202 is a wasteful number, since it uses less digits than its factorization.

640630202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320315103.

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 640630202 is about 25310.6736773244. The cubic root of 640630202 is about 862.0566434391.

Adding to 640630202 its reverse (202036046), we get a palindrome (842666248).

The spelling of 640630202 in words is "six hundred forty million, six hundred thirty thousand, two hundred two".