649893667 has 4 divisors (see below), whose sum is σ = 649945360. Its totient is φ = 649841976.

The previous prime is 649893659. The next prime is 649893677. The reversal of 649893667 is 766398946.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 766398946 = 2 ⋅383199473.

It is a cyclic number.

It is not a de Polignac number, because 649893667 - 2³ = 649893659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649893637) 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, 6538 + ... + 36640.

It is an arithmetic number, because the mean of its divisors is an integer number (162486340).

Almost surely, 2^649893667 is an apocalyptic number.

649893667 is a deficient number, since it is larger than the sum of its proper divisors (51693).

649893667 is a wasteful number, since it uses less digits than its factorization.

649893667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51692.

The product of its digits is 11757312, while the sum is 58.

The square root of 649893667 is about 25493.0121209715. The cubic root of 649893667 is about 866.1918669686.

The spelling of 649893667 in words is "six hundred forty-nine million, eight hundred ninety-three thousand, six hundred sixty-seven".