638608468 has 48 divisors (see below), whose sum is σ = 1250726400. Its totient is φ = 283530240.

The previous prime is 638608459. The next prime is 638608483. The reversal of 638608468 is 864806836.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 362173 + ... + 363931.

It is an arithmetic number, because the mean of its divisors is an integer number (26056800).

Almost surely, 2^638608468 is an apocalyptic number.

638608468 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

638608468 is a deficient number, since it is larger than the sum of its proper divisors (612117932).

638608468 is a wasteful number, since it uses less digits than its factorization.

638608468 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2080 (or 2078 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 49.

The square root of 638608468 is about 25270.7037495991. The cubic root of 638608468 is about 861.1488467971.

The spelling of 638608468 in words is "six hundred thirty-eight million, six hundred eight thousand, four hundred sixty-eight".