638561602 has 24 divisors (see below), whose sum is σ = 1113630336. Its totient is φ = 269010264.

The previous prime is 638561549. The next prime is 638561611. The reversal of 638561602 is 206165836.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42183 + ... + 55285.

It is an arithmetic number, because the mean of its divisors is an integer number (46401264).

Almost surely, 2^638561602 is an apocalyptic number.

638561602 is a deficient number, since it is larger than the sum of its proper divisors (475068734).

638561602 is a wasteful number, since it uses less digits than its factorization.

638561602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13230 (or 13171 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 638561602 is about 25269.7764533048. The cubic root of 638561602 is about 861.1277803737.

The spelling of 638561602 in words is "six hundred thirty-eight million, five hundred sixty-one thousand, six hundred two".