70128239 has 4 divisors (see below), whose sum is σ = 70822680. Its totient is φ = 69433800.

The previous prime is 70128217. The next prime is 70128241. The reversal of 70128239 is 93282107.

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

It is a cyclic number.

It is not a de Polignac number, because 70128239 - 2¹⁶ = 70062703 is a prime.

It is a super-2 number, since 2×70128239² = 9835939810482242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70128299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 347069 + ... + 347270.

It is an arithmetic number, because the mean of its divisors is an integer number (17705670).

Almost surely, 2^70128239 is an apocalyptic number.

70128239 is a deficient number, since it is larger than the sum of its proper divisors (694441).

70128239 is a wasteful number, since it uses less digits than its factorization.

70128239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 694440.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 70128239 is about 8374.2605046655. The cubic root of 70128239 is about 412.3800476442.

It can be divided in two parts, 7012 and 8239, that added together give a palindrome (15251).

The spelling of 70128239 in words is "seventy million, one hundred twenty-eight thousand, two hundred thirty-nine".