638334660 has 48 divisors (see below), whose sum is σ = 1848974400. Its totient is φ = 164352384.

The previous prime is 638334637. The next prime is 638334701. The reversal of 638334660 is 66433836.

It is a super-2 number, since 2×638334660² = 814942276314631200, which contains 22 as substring.

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, 181690 + ... + 185169.

It is an arithmetic number, because the mean of its divisors is an integer number (38520300).

Almost surely, 2^638334660 is an apocalyptic number.

638334660 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

638334660 is an abundant number, since it is smaller than the sum of its proper divisors (1210639740).

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

638334660 is a wasteful number, since it uses less digits than its factorization.

638334660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366900 (or 366898 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 39.

The square root of 638334660 is about 25265.2856702631. The cubic root of 638334660 is about 861.0257546041.

The spelling of 638334660 in words is "six hundred thirty-eight million, three hundred thirty-four thousand, six hundred sixty".