6478638406 has 8 divisors (see below), whose sum is σ = 9812307024. Its totient is φ = 3207869400.

The previous prime is 6478638403. The next prime is 6478638431. The reversal of 6478638406 is 6048368746.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6478638401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15724645 + ... + 15725056.

It is an arithmetic number, because the mean of its divisors is an integer number (1226538378).

Almost surely, 2^6478638406 is an apocalyptic number.

6478638406 is a deficient number, since it is larger than the sum of its proper divisors (3333668618).

6478638406 is a wasteful number, since it uses less digits than its factorization.

6478638406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31449806.

The product of its (nonzero) digits is 4644864, while the sum is 52.

The square root of 6478638406 is about 80489.9894769530. The cubic root of 6478638406 is about 1864.2089145137.

The spelling of 6478638406 in words is "six billion, four hundred seventy-eight million, six hundred thirty-eight thousand, four hundred six".