649967297868 has 360 divisors, whose sum is σ = 2083798886400. Its totient is φ = 175884488640.

The previous prime is 649967297857. The next prime is 649967297893. The reversal of 649967297868 is 868792769946.

649967297868 is a `hidden beast` number, since 6 + 499 + 67 + 2 + 9 + 7 + 8 + 68 = 666.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 23117283 + ... + 23145381.

It is an arithmetic number, because the mean of its divisors is an integer number (5788330240).

Almost surely, 2^649967297868 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 649967297868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1041899443200).

649967297868 is an abundant number, since it is smaller than the sum of its proper divisors (1433831588532).

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

649967297868 is a wasteful number, since it uses less digits than its factorization.

649967297868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28207 (or 28189 counting only the distinct ones).

The product of its digits is 3950456832, while the sum is 81.

The spelling of 649967297868 in words is "six hundred forty-nine billion, nine hundred sixty-seven million, two hundred ninety-seven thousand, eight hundred sixty-eight".