640223814234 has 32 divisors (see below), whose sum is σ = 1282328058816. Its totient is φ = 213094753920.

The previous prime is 640223814157. The next prime is 640223814257. The reversal of 640223814234 is 432418322046.

It is a junction number, because it is equal to n+sod(n) for n = 640223814192 and 640223814201.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12222969 + ... + 12275235.

It is an arithmetic number, because the mean of its divisors is an integer number (40072751838).

Almost surely, 2^640223814234 is an apocalyptic number.

640223814234 is an abundant number, since it is smaller than the sum of its proper divisors (642104244582).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

640223814234 is a wasteful number, since it uses less digits than its factorization.

640223814234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55230.

The product of its (nonzero) digits is 221184, while the sum is 39.

The spelling of 640223814234 in words is "six hundred forty billion, two hundred twenty-three million, eight hundred fourteen thousand, two hundred thirty-four".