128667701 has 8 divisors (see below), whose sum is σ = 133177344. Its totient is φ = 124180560.

The previous prime is 128667689. The next prime is 128667709. The reversal of 128667701 is 107766821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128667701 - 2²² = 124473397 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 (128667709) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6455 + ... + 17291.

It is an arithmetic number, because the mean of its divisors is an integer number (16647168).

Almost surely, 2^128667701 is an apocalyptic number.

It is an amenable number.

128667701 is a deficient number, since it is larger than the sum of its proper divisors (4509643).

128667701 is a wasteful number, since it uses less digits than its factorization.

128667701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11251.

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 128667701 is about 11343.1786109538. The cubic root of 128667701 is about 504.8432032902.

The spelling of 128667701 in words is "one hundred twenty-eight million, six hundred sixty-seven thousand, seven hundred one".