128647742 has 24 divisors (see below), whose sum is σ = 202750824. Its totient is φ = 61175952.

The previous prime is 128647723. The next prime is 128647777. The reversal of 128647742 is 247746821.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 128647742.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 163073 + ... + 163859.

It is an arithmetic number, because the mean of its divisors is an integer number (8447951).

Almost surely, 2^128647742 is an apocalyptic number.

128647742 is a deficient number, since it is larger than the sum of its proper divisors (74103082).

128647742 is an equidigital number, since it uses as much as digits as its factorization.

128647742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 920 (or 873 counting only the distinct ones).

The product of its digits is 150528, while the sum is 41.

The square root of 128647742 is about 11342.2987969811. The cubic root of 128647742 is about 504.8170980945.

The spelling of 128647742 in words is "one hundred twenty-eight million, six hundred forty-seven thousand, seven hundred forty-two".