648634689 has 8 divisors (see below), whose sum is σ = 960940320. Its totient is φ = 432423108.

The previous prime is 648634687. The next prime is 648634709. The reversal of 648634689 is 986436846.

It is not a de Polignac number, because 648634689 - 2¹ = 648634687 is a prime.

It is not an unprimeable number, because it can be changed into a prime (648634687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12011727 + ... + 12011780.

It is an arithmetic number, because the mean of its divisors is an integer number (120117540).

Almost surely, 2^648634689 is an apocalyptic number.

It is an amenable number.

648634689 is a deficient number, since it is larger than the sum of its proper divisors (312305631).

648634689 is a wasteful number, since it uses less digits than its factorization.

648634689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24023516 (or 24023510 counting only the distinct ones).

The product of its digits is 5971968, while the sum is 54.

The square root of 648634689 is about 25468.3075409419. The cubic root of 648634689 is about 865.6321746663.

The spelling of 648634689 in words is "six hundred forty-eight million, six hundred thirty-four thousand, six hundred eighty-nine".