648475817 has 4 divisors (see below), whose sum is σ = 707428176. Its totient is φ = 589523460.

The previous prime is 648475799. The next prime is 648475831. The reversal of 648475817 is 718574846.

It is a happy number.

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 648475817 - 2⁶ = 648475753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (648475517) 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, 29476163 + ... + 29476184.

It is an arithmetic number, because the mean of its divisors is an integer number (176857044).

Almost surely, 2^648475817 is an apocalyptic number.

It is an amenable number.

648475817 is a deficient number, since it is larger than the sum of its proper divisors (58952359).

648475817 is a wasteful number, since it uses less digits than its factorization.

648475817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58952358.

The product of its digits is 1505280, while the sum is 50.

The square root of 648475817 is about 25465.1883362366. The cubic root of 648475817 is about 865.5614949515.

The spelling of 648475817 in words is "six hundred forty-eight million, four hundred seventy-five thousand, eight hundred seventeen".