638673744700 has 36 divisors (see below), whose sum is σ = 1386092190672. Its totient is φ = 255438131200.

The previous prime is 638673744641. The next prime is 638673744703. The reversal of 638673744700 is 7447376836.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638673744703) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 435132 + ... + 1211068.

It is an arithmetic number, because the mean of its divisors is an integer number (38502560852).

Almost surely, 2^638673744700 is an apocalyptic number.

It is an amenable number.

638673744700 is an abundant number, since it is smaller than the sum of its proper divisors (747418445972).

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

638673744700 is a wasteful number, since it uses less digits than its factorization.

638673744700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 784182 (or 784175 counting only the distinct ones).

The product of its (nonzero) digits is 14224896, while the sum is 55.

The spelling of 638673744700 in words is "six hundred thirty-eight billion, six hundred seventy-three million, seven hundred forty-four thousand, seven hundred".