649776 has 20 divisors (see below), whose sum is σ = 1678712. Its totient is φ = 216576.

The previous prime is 649771. The next prime is 649777. The reversal of 649776 is 677946.

It is an Ulam number.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (649771) by changing a digit.

649776 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6721 + ... + 6816.

2⁶⁴⁹⁷⁷⁶ is an apocalyptic number.

It is an amenable number.

649776 is an abundant number, since it is smaller than the sum of its proper divisors (1028936).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

649776 is a wasteful number, since it uses less digits than its factorization.

649776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13548 (or 13542 counting only the distinct ones).

The product of its digits is 63504, while the sum is 39.

The square root of 649776 is about 806.0868439567. The cubic root of 649776 is about 86.6139587467.

The spelling of 649776 in words is "six hundred forty-nine thousand, seven hundred seventy-six".