70257217 has 4 divisors (see below), whose sum is σ = 70275520. Its totient is φ = 70238916.

The previous prime is 70257199. The next prime is 70257221. The reversal of 70257217 is 71275207.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 71275207 = 4679 ⋅15233.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-70257217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70257247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 933 + ... + 11890.

It is an arithmetic number, because the mean of its divisors is an integer number (17568880).

Almost surely, 2^70257217 is an apocalyptic number.

It is an amenable number.

70257217 is a deficient number, since it is larger than the sum of its proper divisors (18303).

70257217 is a wasteful number, since it uses less digits than its factorization.

70257217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18302.

The product of its (nonzero) digits is 6860, while the sum is 31.

The square root of 70257217 is about 8381.9578261883. The cubic root of 70257217 is about 412.6327056344.

The spelling of 70257217 in words is "seventy million, two hundred fifty-seven thousand, two hundred seventeen".