644742267700 has 36 divisors (see below), whose sum is σ = 1409770831392. Its totient is φ = 255928223200.

The previous prime is 644742267667. The next prime is 644742267713. The reversal of 644742267700 is 7762247446.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24595384 + ... + 24621583.

It is an arithmetic number, because the mean of its divisors is an integer number (39160300872).

Almost surely, 2^644742267700 is an apocalyptic number.

It is an amenable number.

644742267700 is an abundant number, since it is smaller than the sum of its proper divisors (765028563692).

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

644742267700 is a wasteful number, since it uses less digits than its factorization.

644742267700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49217112 (or 49217105 counting only the distinct ones).

The product of its (nonzero) digits is 3161088, while the sum is 49.

The spelling of 644742267700 in words is "six hundred forty-four billion, seven hundred forty-two million, two hundred sixty-seven thousand, seven hundred".