649778716 has 6 divisors (see below), whose sum is σ = 1137112760. Its totient is φ = 324889356.

The previous prime is 649778707. The next prime is 649778729. The reversal of 649778716 is 617877946.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81222336 + ... + 81222343.

Almost surely, 2^649778716 is an apocalyptic number.

It is an amenable number.

649778716 is a deficient number, since it is larger than the sum of its proper divisors (487334044).

649778716 is a wasteful number, since it uses less digits than its factorization.

649778716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162444683 (or 162444681 counting only the distinct ones).

The product of its digits is 3556224, while the sum is 55.

The square root of 649778716 is about 25490.7574622646. The cubic root of 649778716 is about 866.1407942586.

The spelling of 649778716 in words is "six hundred forty-nine million, seven hundred seventy-eight thousand, seven hundred sixteen".