649971296 has 72 divisors (see below), whose sum is σ = 1430702784. Its totient is φ = 290234880.

The previous prime is 649971293. The next prime is 649971307. The reversal of 649971296 is 692179946.

649971296 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649971293) 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, 165710 + ... + 169586.

It is an arithmetic number, because the mean of its divisors is an integer number (19870872).

Almost surely, 2^649971296 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 649971296, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (715351392).

649971296 is an abundant number, since it is smaller than the sum of its proper divisors (780731488).

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

649971296 is a wasteful number, since it uses less digits than its factorization.

649971296 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3944 (or 3923 counting only the distinct ones).

The product of its digits is 1469664, while the sum is 53.

The square root of 649971296 is about 25494.5346299947. The cubic root of 649971296 is about 866.2263541136.

The spelling of 649971296 in words is "six hundred forty-nine million, nine hundred seventy-one thousand, two hundred ninety-six".