640623304426 has 32 divisors (see below), whose sum is σ = 1123968688128. Its totient is φ = 268115989680.

The previous prime is 640623304423. The next prime is 640623304439. The reversal of 640623304426 is 624403326046.

It is not an unprimeable number, because it can be changed into a prime (640623304423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3092071 + ... + 3292741.

It is an arithmetic number, because the mean of its divisors is an integer number (35124021504).

Almost surely, 2^640623304426 is an apocalyptic number.

640623304426 is a deficient number, since it is larger than the sum of its proper divisors (483345383702).

640623304426 is a wasteful number, since it uses less digits than its factorization.

640623304426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206026.

The product of its (nonzero) digits is 497664, while the sum is 40.

The spelling of 640623304426 in words is "six hundred forty billion, six hundred twenty-three million, three hundred four thousand, four hundred twenty-six".