6464903638 has 4 divisors (see below), whose sum is σ = 9697355460. Its totient is φ = 3232451818.

The previous prime is 6464903629. The next prime is 6464903639. The reversal of 6464903638 is 8363094646.

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

It is a junction number, because it is equal to n+sod(n) for n = 6464903591 and 6464903600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6464903639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1616225908 + ... + 1616225911.

It is an arithmetic number, because the mean of its divisors is an integer number (2424338865).

Almost surely, 2^6464903638 is an apocalyptic number.

6464903638 is a deficient number, since it is larger than the sum of its proper divisors (3232451822).

6464903638 is a wasteful number, since it uses less digits than its factorization.

6464903638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3232451821.

The product of its (nonzero) digits is 2239488, while the sum is 49.

The square root of 6464903638 is about 80404.6244814314. The cubic root of 6464903638 is about 1862.8906029292.

The spelling of 6464903638 in words is "six billion, four hundred sixty-four million, nine hundred three thousand, six hundred thirty-eight".