649694256 has 40 divisors (see below), whose sum is σ = 1680998064. Its totient is φ = 216226560.

The previous prime is 649694191. The next prime is 649694257. The reversal of 649694256 is 652496946.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 649694199 and 649694208.

It is not an unprimeable number, because it can be changed into a prime (649694257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21490 + ... + 41966.

Almost surely, 2^649694256 is an apocalyptic number.

It is an amenable number.

649694256 is an abundant number, since it is smaller than the sum of its proper divisors (1031303808).

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

649694256 is a wasteful number, since it uses less digits than its factorization.

649694256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21149 (or 21143 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 51.

The square root of 649694256 is about 25489.1007295275. The cubic root of 649694256 is about 866.1032648559.

The spelling of 649694256 in words is "six hundred forty-nine million, six hundred ninety-four thousand, two hundred fifty-six".