638486630 has 16 divisors (see below), whose sum is σ = 1163124144. Its totient is φ = 252317280.

The previous prime is 638486581. The next prime is 638486657. The reversal of 638486630 is 36684836.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 383801 + ... + 385460.

It is an arithmetic number, because the mean of its divisors is an integer number (72695259).

Almost surely, 2^638486630 is an apocalyptic number.

638486630 is a deficient number, since it is larger than the sum of its proper divisors (524637514).

638486630 is a wasteful number, since it uses less digits than its factorization.

638486630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 769351.

The product of its (nonzero) digits is 497664, while the sum is 44.

The square root of 638486630 is about 25268.2929775638. The cubic root of 638486630 is about 861.0940780660.

The spelling of 638486630 in words is "six hundred thirty-eight million, four hundred eighty-six thousand, six hundred thirty".