128465667 has 12 divisors (see below), whose sum is σ = 202430904. Its totient is φ = 77857920.

The previous prime is 128465663. The next prime is 128465681. The reversal of 128465667 is 766564821.

128465667 is a `hidden beast` number, since 1 + 2 + 84 + 6 + 566 + 7 = 666.

It is not a de Polignac number, because 128465667 - 2² = 128465663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128465663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 648718 + ... + 648915.

It is an arithmetic number, because the mean of its divisors is an integer number (16869242).

Almost surely, 2^128465667 is an apocalyptic number.

128465667 is a deficient number, since it is larger than the sum of its proper divisors (73965237).

128465667 is a wasteful number, since it uses less digits than its factorization.

128465667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1297650 (or 1297647 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The square root of 128465667 is about 11334.2695838770. The cubic root of 128465667 is about 504.5788299678.

The spelling of 128465667 in words is "one hundred twenty-eight million, four hundred sixty-five thousand, six hundred sixty-seven".