640053426 has 32 divisors (see below), whose sum is σ = 1309167360. Its totient is φ = 208520576.

The previous prime is 640053413. The next prime is 640053431. The reversal of 640053426 is 624350046.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 640053393 and 640053402.

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, 308320 + ... + 310388.

It is an arithmetic number, because the mean of its divisors is an integer number (40911480).

Almost surely, 2^640053426 is an apocalyptic number.

640053426 is an abundant number, since it is smaller than the sum of its proper divisors (669113934).

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

640053426 is a wasteful number, since it uses less digits than its factorization.

640053426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3218.

The product of its (nonzero) digits is 17280, while the sum is 30.

The square root of 640053426 is about 25299.2771833505. The cubic root of 640053426 is about 861.7978551013.

The spelling of 640053426 in words is "six hundred forty million, fifty-three thousand, four hundred twenty-six".