128933642 has 4 divisors (see below), whose sum is σ = 193400466. Its totient is φ = 64466820.

The previous prime is 128933633. The next prime is 128933647. The reversal of 128933642 is 246339821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 117917881 + 11015761 = 10859^2 + 3319^2 .

It is a junction number, because it is equal to n+sod(n) for n = 128933596 and 128933605.

It is not an unprimeable number, because it can be changed into a prime (128933647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32233409 + ... + 32233412.

Almost surely, 2^128933642 is an apocalyptic number.

128933642 is a deficient number, since it is larger than the sum of its proper divisors (64466824).

128933642 is an equidigital number, since it uses as much as digits as its factorization.

128933642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64466823.

The product of its digits is 62208, while the sum is 38.

The square root of 128933642 is about 11354.8950677670. The cubic root of 128933642 is about 505.1907811011.

The spelling of 128933642 in words is "one hundred twenty-eight million, nine hundred thirty-three thousand, six hundred forty-two".