70128217 has 2 divisors, whose sum is σ = 70128218. Its totient is φ = 70128216.

The previous prime is 70128211. The next prime is 70128241. The reversal of 70128217 is 71282107.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63425296 + 6702921 = 7964^2 + 2589^2 .

It is a cyclic number.

It is not a de Polignac number, because 70128217 - 2²³ = 61739609 is a prime.

It is not a weakly prime, because it can be changed into another prime (70128211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35064108 + 35064109.

It is an arithmetic number, because the mean of its divisors is an integer number (35064109).

Almost surely, 2^70128217 is an apocalyptic number.

It is an amenable number.

70128217 is a deficient number, since it is larger than the sum of its proper divisors (1).

70128217 is an equidigital number, since it uses as much as digits as its factorization.

70128217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1568, while the sum is 28.

The square root of 70128217 is about 8374.2591911165. The cubic root of 70128217 is about 412.3800045215.

The spelling of 70128217 in words is "seventy million, one hundred twenty-eight thousand, two hundred seventeen".