647381408 has 48 divisors (see below), whose sum is σ = 1308436416. Its totient is φ = 315194880.

The previous prime is 647381393. The next prime is 647381443. The reversal of 647381408 is 804183746.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 186860 + ... + 190292.

It is an arithmetic number, because the mean of its divisors is an integer number (27259092).

Almost surely, 2^647381408 is an apocalyptic number.

It is an amenable number.

647381408 is an abundant number, since it is smaller than the sum of its proper divisors (661055008).

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

647381408 is a wasteful number, since it uses less digits than its factorization.

647381408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3597 (or 3589 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 41.

The square root of 647381408 is about 25443.6909272220. The cubic root of 647381408 is about 865.0742952435.

The spelling of 647381408 in words is "six hundred forty-seven million, three hundred eighty-one thousand, four hundred eight".