640028820046 has 48 divisors (see below), whose sum is σ = 1271280977280. Its totient is φ = 238520047920.

The previous prime is 640028819971. The next prime is 640028820047.

640028820046 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 640028819990 and 640028820008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640028820047) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12882136 + ... + 12931723.

It is an arithmetic number, because the mean of its divisors is an integer number (26485020360).

Almost surely, 2^640028820046 is an apocalyptic number.

640028820046 is a deficient number, since it is larger than the sum of its proper divisors (631252157234).

640028820046 is a wasteful number, since it uses less digits than its factorization.

640028820046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25813909 (or 25813902 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 40.

The spelling of 640028820046 in words is "six hundred forty billion, twenty-eight million, eight hundred twenty thousand, forty-six".