649910776 has 8 divisors (see below), whose sum is σ = 1218582720. Its totient is φ = 324955384.

The previous prime is 649910693. The next prime is 649910777. The reversal of 649910776 is 677019946.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649910777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40619416 + ... + 40619431.

It is an arithmetic number, because the mean of its divisors is an integer number (152322840).

Almost surely, 2^649910776 is an apocalyptic number.

It is an amenable number.

649910776 is a deficient number, since it is larger than the sum of its proper divisors (568671944).

649910776 is a wasteful number, since it uses less digits than its factorization.

649910776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81238853 (or 81238849 counting only the distinct ones).

The product of its (nonzero) digits is 571536, while the sum is 49.

The square root of 649910776 is about 25493.3476813070. The cubic root of 649910776 is about 866.1994679795.

The spelling of 649910776 in words is "six hundred forty-nine million, nine hundred ten thousand, seven hundred seventy-six".