649488775 has 12 divisors (see below), whose sum is σ = 867317752. Its totient is φ = 479622240.

The previous prime is 649488773. The next prime is 649488809. The reversal of 649488775 is 577884946.

It is not a de Polignac number, because 649488775 - 2¹ = 649488773 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 (649488773) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 998889 + ... + 999538.

Almost surely, 2^649488775 is an apocalyptic number.

649488775 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

649488775 is a deficient number, since it is larger than the sum of its proper divisors (217828977).

649488775 is a wasteful number, since it uses less digits than its factorization.

649488775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1998450 (or 1998445 counting only the distinct ones).

The product of its digits is 13547520, while the sum is 58.

The square root of 649488775 is about 25485.0696487179. The cubic root of 649488775 is about 866.0119467583.

The spelling of 649488775 in words is "six hundred forty-nine million, four hundred eighty-eight thousand, seven hundred seventy-five".