638321480 has 16 divisors (see below), whose sum is σ = 1436223420. Its totient is φ = 255328576.

The previous prime is 638321479. The next prime is 638321561. The reversal of 638321480 is 84123836.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 609398596 + 28922884 = 24686^2 + 5378^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 638321480.

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, 7978979 + ... + 7979058.

Almost surely, 2^638321480 is an apocalyptic number.

It is an amenable number.

638321480 is an abundant number, since it is smaller than the sum of its proper divisors (797901940).

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

638321480 is a wasteful number, since it uses less digits than its factorization.

638321480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15958048 (or 15958044 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 638321480 is about 25265.0248367184. The cubic root of 638321480 is about 861.0198285603.

The spelling of 638321480 in words is "six hundred thirty-eight million, three hundred twenty-one thousand, four hundred eighty".