70785217 has 2 divisors, whose sum is σ = 70785218. Its totient is φ = 70785216.

The previous prime is 70785151. The next prime is 70785223. The reversal of 70785217 is 71258707.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58507201 + 12278016 = 7649^2 + 3504^2 .

It is a cyclic number.

It is not a de Polignac number, because 70785217 - 2¹¹ = 70783169 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (70785257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35392608 + 35392609.

It is an arithmetic number, because the mean of its divisors is an integer number (35392609).

Almost surely, 2^70785217 is an apocalyptic number.

It is an amenable number.

70785217 is a deficient number, since it is larger than the sum of its proper divisors (1).

70785217 is an equidigital number, since it uses as much as digits as its factorization.

70785217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27440, while the sum is 37.

The square root of 70785217 is about 8413.3950935398. The cubic root of 70785217 is about 413.6638051812.

The spelling of 70785217 in words is "seventy million, seven hundred eighty-five thousand, two hundred seventeen".