638740096 has 16 divisors (see below), whose sum is σ = 1272490290. Its totient is φ = 319369984.

The previous prime is 638740087. The next prime is 638740111. The reversal of 638740096 is 690047836.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 563397696 + 75342400 = 23736^2 + 8680^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2494951 + ... + 2495206.

Almost surely, 2^638740096 is an apocalyptic number.

It is an amenable number.

638740096 is a deficient number, since it is larger than the sum of its proper divisors (633750194).

638740096 is an equidigital number, since it uses as much as digits as its factorization.

638740096 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4990171 (or 4990159 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 638740096 is about 25273.3079750159. The cubic root of 638740096 is about 861.2080085105.

The spelling of 638740096 in words is "six hundred thirty-eight million, seven hundred forty thousand, ninety-six".