638647342 has 16 divisors (see below), whose sum is σ = 1010822400. Its totient is φ = 301787640.

The previous prime is 638647333. The next prime is 638647393. The reversal of 638647342 is 243746836.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4134 + ... + 35977.

It is an arithmetic number, because the mean of its divisors is an integer number (63176400).

Almost surely, 2^638647342 is an apocalyptic number.

638647342 is a deficient number, since it is larger than the sum of its proper divisors (372175058).

638647342 is a wasteful number, since it uses less digits than its factorization.

638647342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40551.

The product of its digits is 580608, while the sum is 43.

The square root of 638647342 is about 25271.4728894063. The cubic root of 638647342 is about 861.1663200078.

The spelling of 638647342 in words is "six hundred thirty-eight million, six hundred forty-seven thousand, three hundred forty-two".