638620204346 has 8 divisors (see below), whose sum is σ = 968693568660. Its totient is φ = 315722348128.

The previous prime is 638620204333. The next prime is 638620204363. The reversal of 638620204346 is 643402026836.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 499480014121 + 139140190225 = 706739^2 + 373015^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 638620204297 and 638620204306.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1793876801 + ... + 1793877156.

Almost surely, 2^638620204346 is an apocalyptic number.

638620204346 is a deficient number, since it is larger than the sum of its proper divisors (330073364314).

638620204346 is a wasteful number, since it uses less digits than its factorization.

638620204346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3587754048.

The product of its (nonzero) digits is 995328, while the sum is 44.

The spelling of 638620204346 in words is "six hundred thirty-eight billion, six hundred twenty million, two hundred four thousand, three hundred forty-six".