128632742 has 12 divisors (see below), whose sum is σ = 224451180. Its totient is φ = 55128276.

The previous prime is 128632741. The next prime is 128632747. The reversal of 128632742 is 247236821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128632741) 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, 656192 + ... + 656387.

It is an arithmetic number, because the mean of its divisors is an integer number (18704265).

Almost surely, 2^128632742 is an apocalyptic number.

128632742 is a deficient number, since it is larger than the sum of its proper divisors (95818438).

128632742 is a wasteful number, since it uses less digits than its factorization.

128632742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1312595 (or 1312588 counting only the distinct ones).

The product of its digits is 32256, while the sum is 35.

The square root of 128632742 is about 11341.6375360880. The cubic root of 128632742 is about 504.7974772014.

The spelling of 128632742 in words is "one hundred twenty-eight million, six hundred thirty-two thousand, seven hundred forty-two".