70687217 has 2 divisors, whose sum is σ = 70687218. Its totient is φ = 70687216.

The previous prime is 70687193. The next prime is 70687219. The reversal of 70687217 is 71278607.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44102881 + 26584336 = 6641^2 + 5156^2 .

It is a cyclic number.

It is not a de Polignac number, because 70687217 - 2⁶ = 70687153 is a prime.

Together with 70687219, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (70687219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35343608 + 35343609.

It is an arithmetic number, because the mean of its divisors is an integer number (35343609).

Almost surely, 2^70687217 is an apocalyptic number.

It is an amenable number.

70687217 is a deficient number, since it is larger than the sum of its proper divisors (1).

70687217 is an equidigital number, since it uses as much as digits as its factorization.

70687217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32928, while the sum is 38.

The square root of 70687217 is about 8407.5690303440. The cubic root of 70687217 is about 413.4728153230.

The spelling of 70687217 in words is "seventy million, six hundred eighty-seven thousand, two hundred seventeen".