640143452 has 24 divisors (see below), whose sum is σ = 1258879776. Its totient is φ = 282604608.

The previous prime is 640143407. The next prime is 640143503. The reversal of 640143452 is 254341046.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 266423 + ... + 268814.

It is an arithmetic number, because the mean of its divisors is an integer number (52453324).

Almost surely, 2^640143452 is an apocalyptic number.

It is an amenable number.

640143452 is a deficient number, since it is larger than the sum of its proper divisors (618736324).

640143452 is a wasteful number, since it uses less digits than its factorization.

640143452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535277 (or 535275 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 640143452 is about 25301.0563415838. The cubic root of 640143452 is about 861.8382582788.

Adding to 640143452 its reverse (254341046), we get a palindrome (894484498).

The spelling of 640143452 in words is "six hundred forty million, one hundred forty-three thousand, four hundred fifty-two".