638487070 has 48 divisors (see below), whose sum is σ = 1248689520. Its totient is φ = 234953472.

The previous prime is 638487049. The next prime is 638487079. The reversal of 638487070 is 70784836.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638487079) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 788826 + ... + 789634.

It is an arithmetic number, because the mean of its divisors is an integer number (26014365).

Almost surely, 2^638487070 is an apocalyptic number.

638487070 is a deficient number, since it is larger than the sum of its proper divisors (610202450).

638487070 is a wasteful number, since it uses less digits than its factorization.

638487070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1309 (or 1296 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 43.

The square root of 638487070 is about 25268.3016841259. The cubic root of 638487070 is about 861.0942758677.

The spelling of 638487070 in words is "six hundred thirty-eight million, four hundred eighty-seven thousand, seventy".