638650090760 has 64 divisors (see below), whose sum is σ = 1569588390720. Its totient is φ = 231941180160.

The previous prime is 638650090753. The next prime is 638650090807. The reversal of 638650090760 is 67090056836.

It is a junction number, because it is equal to n+sod(n) for n = 638650090699 and 638650090708.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 575879 + ... + 1268438.

It is an arithmetic number, because the mean of its divisors is an integer number (24524818605).

Almost surely, 2^638650090760 is an apocalyptic number.

It is an amenable number.

638650090760 is an abundant number, since it is smaller than the sum of its proper divisors (930938299960).

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

638650090760 is a wasteful number, since it uses less digits than its factorization.

638650090760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1845126 (or 1845122 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 50.

The spelling of 638650090760 in words is "six hundred thirty-eight billion, six hundred fifty million, ninety thousand, seven hundred sixty".