8457688217 has 4 divisors (see below), whose sum is σ = 9226568976. Its totient is φ = 7688807460.

The previous prime is 8457688153. The next prime is 8457688223. The reversal of 8457688217 is 7128867548.

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.

It is a cyclic number.

It is not a de Polignac number, because 8457688217 - 2⁶ = 8457688153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8457688517) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 384440363 + ... + 384440384.

It is an arithmetic number, because the mean of its divisors is an integer number (2306642244).

Almost surely, 2^8457688217 is an apocalyptic number.

It is an amenable number.

8457688217 is a deficient number, since it is larger than the sum of its proper divisors (768880759).

8457688217 is a wasteful number, since it uses less digits than its factorization.

8457688217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 768880758.

The product of its digits is 6021120, while the sum is 56.

The square root of 8457688217 is about 91965.6904339874. The cubic root of 8457688217 is about 2037.4356007196.

The spelling of 8457688217 in words is "eight billion, four hundred fifty-seven million, six hundred eighty-eight thousand, two hundred seventeen".