648896947 has 4 divisors (see below), whose sum is σ = 654850240. Its totient is φ = 642943656.

The previous prime is 648896939. The next prime is 648896957. The reversal of 648896947 is 749698846.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 648896947 - 2³ = 648896939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (648896957) 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, 2976483 + ... + 2976700.

It is an arithmetic number, because the mean of its divisors is an integer number (163712560).

Almost surely, 2^648896947 is an apocalyptic number.

648896947 is a deficient number, since it is larger than the sum of its proper divisors (5953293).

648896947 is a wasteful number, since it uses less digits than its factorization.

648896947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5953292.

The product of its digits is 20901888, while the sum is 61.

The square root of 648896947 is about 25473.4557333708. The cubic root of 648896947 is about 865.7488239797.

The spelling of 648896947 in words is "six hundred forty-eight million, eight hundred ninety-six thousand, nine hundred forty-seven".