128403667 has 6 divisors (see below), whose sum is σ = 149367588. Its totient is φ = 110060244.

The previous prime is 128403659. The next prime is 128403679. The reversal of 128403667 is 766304821.

It is not a de Polignac number, because 128403667 - 2³ = 128403659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128403607) 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, 1310193 + ... + 1310290.

It is an arithmetic number, because the mean of its divisors is an integer number (24894598).

Almost surely, 2^128403667 is an apocalyptic number.

128403667 is a deficient number, since it is larger than the sum of its proper divisors (20963921).

128403667 is an equidigital number, since it uses as much as digits as its factorization.

128403667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2620497 (or 2620490 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 128403667 is about 11331.5341856255. The cubic root of 128403667 is about 504.4976437587.

The spelling of 128403667 in words is "one hundred twenty-eight million, four hundred three thousand, six hundred sixty-seven".