648723791 has 6 divisors (see below), whose sum is σ = 689129040. Its totient is φ = 610563296.

The previous prime is 648723781. The next prime is 648723793. The reversal of 648723791 is 197327846.

It is not a de Polignac number, because 648723791 - 2¹⁸ = 648461647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648723793) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1122071 + ... + 1122648.

It is an arithmetic number, because the mean of its divisors is an integer number (114854840).

Almost surely, 2^648723791 is an apocalyptic number.

648723791 is a deficient number, since it is larger than the sum of its proper divisors (40405249).

648723791 is a wasteful number, since it uses less digits than its factorization.

648723791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2244753 (or 2244736 counting only the distinct ones).

The product of its digits is 508032, while the sum is 47.

The square root of 648723791 is about 25470.0567529796. The cubic root of 648723791 is about 865.6718097274.

The spelling of 648723791 in words is "six hundred forty-eight million, seven hundred twenty-three thousand, seven hundred ninety-one".