640283327994 has 64 divisors (see below), whose sum is σ = 1368890265600. Its totient is φ = 199059493248.

The previous prime is 640283327953. The next prime is 640283328001. The reversal of 640283327994 is 499723382046.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13411414 + ... + 13459070.

It is an arithmetic number, because the mean of its divisors is an integer number (21388910400).

Almost surely, 2^640283327994 is an apocalyptic number.

640283327994 is an abundant number, since it is smaller than the sum of its proper divisors (728606937606).

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

640283327994 is a wasteful number, since it uses less digits than its factorization.

640283327994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49507.

The product of its (nonzero) digits is 15676416, while the sum is 57.

The spelling of 640283327994 in words is "six hundred forty billion, two hundred eighty-three million, three hundred twenty-seven thousand, nine hundred ninety-four".