128442699 has 32 divisors (see below), whose sum is σ = 237242880. Its totient is φ = 66722400.

The previous prime is 128442659. The next prime is 128442731. The reversal of 128442699 is 996244821.

It is not a de Polignac number, because 128442699 - 2⁸ = 128442443 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128442659) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28812 + ... + 32969.

It is an arithmetic number, because the mean of its divisors is an integer number (7413840).

Almost surely, 2^128442699 is an apocalyptic number.

128442699 is a deficient number, since it is larger than the sum of its proper divisors (108800181).

128442699 is a wasteful number, since it uses less digits than its factorization.

128442699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61808 (or 61802 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 128442699 is about 11333.2563281698. The cubic root of 128442699 is about 504.5487574523.

The spelling of 128442699 in words is "one hundred twenty-eight million, four hundred forty-two thousand, six hundred ninety-nine".