649474357896 has 256 divisors, whose sum is σ = 2225467238400. Its totient is φ = 170900990208.

The previous prime is 649474357891. The next prime is 649474357907. The reversal of 649474357896 is 698753474946.

It is a happy number.

649474357896 is a `hidden beast` number, since 6 + 4 + 9 + 4 + 7 + 43 + 578 + 9 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is not an unprimeable number, because it can be changed into a prime (649474357891) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 8670315 + ... + 8744901.

It is an arithmetic number, because the mean of its divisors is an integer number (8693231400).

Almost surely, 2^649474357896 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 649474357896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1112733619200).

649474357896 is an abundant number, since it is smaller than the sum of its proper divisors (1575992880504).

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

649474357896 is a wasteful number, since it uses less digits than its factorization.

649474357896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75065 (or 75055 counting only the distinct ones).

The product of its digits is 1097349120, while the sum is 72.

The spelling of 649474357896 in words is "six hundred forty-nine billion, four hundred seventy-four million, three hundred fifty-seven thousand, eight hundred ninety-six".