128717616 has 20 divisors (see below), whose sum is σ = 332520632. Its totient is φ = 42905856.

The previous prime is 128717599. The next prime is 128717629. The reversal of 128717616 is 616717821.

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, 1340761 + ... + 1340856.

Almost surely, 2^128717616 is an apocalyptic number.

128717616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

128717616 is an abundant number, since it is smaller than the sum of its proper divisors (203803016).

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

128717616 is a wasteful number, since it uses less digits than its factorization.

128717616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2681628 (or 2681622 counting only the distinct ones).

The product of its digits is 28224, while the sum is 39.

The square root of 128717616 is about 11345.3786186271. The cubic root of 128717616 is about 504.9084773526.

The spelling of 128717616 in words is "one hundred twenty-eight million, seven hundred seventeen thousand, six hundred sixteen".