647138459904 has 72 divisors (see below), whose sum is σ = 1724825982432. Its totient is φ = 215400468480.

The previous prime is 647138459899. The next prime is 647138459911. The reversal of 647138459904 is 409954831746.

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, 79029 + ... + 1140404.

Almost surely, 2^647138459904 is an apocalyptic number.

647138459904 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 647138459904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (862412991216).

647138459904 is an abundant number, since it is smaller than the sum of its proper divisors (1077687522528).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

647138459904 is a wasteful number, since it uses less digits than its factorization.

647138459904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1220143 (or 1220129 counting only the distinct ones).

The product of its (nonzero) digits is 26127360, while the sum is 60.

The spelling of 647138459904 in words is "six hundred forty-seven billion, one hundred thirty-eight million, four hundred fifty-nine thousand, nine hundred four".