128345242 has 16 divisors (see below), whose sum is σ = 201891240. Its totient is φ = 61108992.

The previous prime is 128345201. The next prime is 128345309. The reversal of 128345242 is 242543821.

It can be written as a sum of positive squares in 4 ways, for example, as 126810121 + 1535121 = 11261^2 + 1239^2 .

It is a super-2 number, since 2×128345242² = 32945002288077128, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10923 + ... + 19390.

Almost surely, 2^128345242 is an apocalyptic number.

128345242 is a deficient number, since it is larger than the sum of its proper divisors (73545998).

128345242 is a wasteful number, since it uses less digits than its factorization.

128345242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30417.

The product of its digits is 15360, while the sum is 31.

The square root of 128345242 is about 11328.9559095267. The cubic root of 128345242 is about 504.4211149305.

The spelling of 128345242 in words is "one hundred twenty-eight million, three hundred forty-five thousand, two hundred forty-two".