640136422 has 16 divisors (see below), whose sum is σ = 998323200. Its totient is φ = 307510920.

The previous prime is 640136407. The next prime is 640136443. The reversal of 640136422 is 224631046.

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, 28522 + ... + 45757.

It is an arithmetic number, because the mean of its divisors is an integer number (62395200).

Almost surely, 2^640136422 is an apocalyptic number.

640136422 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

640136422 is a deficient number, since it is larger than the sum of its proper divisors (358186778).

640136422 is a wasteful number, since it uses less digits than its factorization.

640136422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74451.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 640136422 is about 25300.9174141967. The cubic root of 640136422 is about 861.8351033895.

Adding to 640136422 its reverse (224631046), we get a palindrome (864767468).

The spelling of 640136422 in words is "six hundred forty million, one hundred thirty-six thousand, four hundred twenty-two".