128616767 has 4 divisors (see below), whose sum is σ = 128671776. Its totient is φ = 128561760.

The previous prime is 128616721. The next prime is 128616779. The reversal of 128616767 is 767616821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 128616767 - 2²⁴ = 111839551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128616797) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23834 + ... + 28727.

It is an arithmetic number, because the mean of its divisors is an integer number (32167944).

Almost surely, 2^128616767 is an apocalyptic number.

128616767 is a deficient number, since it is larger than the sum of its proper divisors (55009).

128616767 is an equidigital number, since it uses as much as digits as its factorization.

128616767 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55008.

The product of its digits is 169344, while the sum is 44.

The square root of 128616767 is about 11340.9332508396. The cubic root of 128616767 is about 504.7765792728.

The spelling of 128616767 in words is "one hundred twenty-eight million, six hundred sixteen thousand, seven hundred sixty-seven".