638647462 has 4 divisors (see below), whose sum is σ = 957971196. Its totient is φ = 319323730.

The previous prime is 638647433. The next prime is 638647469. The reversal of 638647462 is 264746836.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638647469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159661864 + ... + 159661867.

It is an arithmetic number, because the mean of its divisors is an integer number (239492799).

Almost surely, 2^638647462 is an apocalyptic number.

638647462 is a deficient number, since it is larger than the sum of its proper divisors (319323734).

638647462 is a wasteful number, since it uses less digits than its factorization.

638647462 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319323733.

The product of its digits is 1161216, while the sum is 46.

The square root of 638647462 is about 25271.4752636248. The cubic root of 638647462 is about 861.1663739447.

The spelling of 638647462 in words is "six hundred thirty-eight million, six hundred forty-seven thousand, four hundred sixty-two".