640232258 has 4 divisors (see below), whose sum is σ = 960348390. Its totient is φ = 320116128.

The previous prime is 640232231. The next prime is 640232267. The reversal of 640232258 is 852232046.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 614395369 + 25836889 = 24787^2 + 5083^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160058063 + ... + 160058066.

Almost surely, 2^640232258 is an apocalyptic number.

640232258 is a deficient number, since it is larger than the sum of its proper divisors (320116132).

640232258 is a wasteful number, since it uses less digits than its factorization.

640232258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320116131.

The product of its (nonzero) digits is 23040, while the sum is 32.

The square root of 640232258 is about 25302.8112667348. The cubic root of 640232258 is about 861.8781102157.

The spelling of 640232258 in words is "six hundred forty million, two hundred thirty-two thousand, two hundred fifty-eight".