649984763 has 4 divisors (see below), whose sum is σ = 652848360. Its totient is φ = 647121168.

The previous prime is 649984747. The next prime is 649984771. The reversal of 649984763 is 367489946.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 367489946 = 2 ⋅183744973.

It is a cyclic number.

It is not a de Polignac number, because 649984763 - 2⁴ = 649984747 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 649984699 and 649984708.

It is not an unprimeable number, because it can be changed into a prime (649984733) 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, 1431458 + ... + 1431911.

It is an arithmetic number, because the mean of its divisors is an integer number (163212090).

Almost surely, 2^649984763 is an apocalyptic number.

649984763 is a deficient number, since it is larger than the sum of its proper divisors (2863597).

649984763 is a wasteful number, since it uses less digits than its factorization.

649984763 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2863596.

The product of its digits is 7838208, while the sum is 56.

The square root of 649984763 is about 25494.7987440576. The cubic root of 649984763 is about 866.2323366289.

The spelling of 649984763 in words is "six hundred forty-nine million, nine hundred eighty-four thousand, seven hundred sixty-three".