128768647 has 6 divisors (see below), whose sum is σ = 147198488. Its totient is φ = 110347392.

The previous prime is 128768623. The next prime is 128768663. The reversal of 128768647 is 746867821.

It is a happy number.

It is not a de Polignac number, because 128768647 - 2¹⁵ = 128735879 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128768647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128768687) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27879 + ... + 32167.

Almost surely, 2^128768647 is an apocalyptic number.

128768647 is a deficient number, since it is larger than the sum of its proper divisors (18429841).

128768647 is an frugal number, since it uses more digits than its factorization.

128768647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8585 (or 4296 counting only the distinct ones).

The product of its digits is 903168, while the sum is 49.

The square root of 128768647 is about 11347.6273731560. The cubic root of 128768647 is about 504.9751933702.

The spelling of 128768647 in words is "one hundred twenty-eight million, seven hundred sixty-eight thousand, six hundred forty-seven".