647771068 has 12 divisors (see below), whose sum is σ = 1295542192. Its totient is φ = 277616160.

The previous prime is 647771053. The next prime is 647771081. The reversal of 647771068 is 860177746.

647771068 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11567313 + ... + 11567368.

Almost surely, 2^647771068 is an apocalyptic number.

It is an amenable number.

647771068 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

647771068 is a wasteful number, since it uses less digits than its factorization.

647771068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23134692 (or 23134690 counting only the distinct ones).

The product of its (nonzero) digits is 395136, while the sum is 46.

The square root of 647771068 is about 25451.3470763337. The cubic root of 647771068 is about 865.2478236755.

The spelling of 647771068 in words is "six hundred forty-seven million, seven hundred seventy-one thousand, sixty-eight".