649670616 has 144 divisors (see below), whose sum is σ = 2067123240. Its totient is φ = 183778560.

The previous prime is 649670611. The next prime is 649670621. The reversal of 649670616 is 616076946.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (649670611) and next prime (649670621).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649670611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 376636 + ... + 378356.

Almost surely, 2^649670616 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 649670616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1033561620).

649670616 is an abundant number, since it is smaller than the sum of its proper divisors (1417452624).

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

649670616 is a wasteful number, since it uses less digits than its factorization.

649670616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1854 (or 1840 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The square root of 649670616 is about 25488.6369976898. The cubic root of 649670616 is about 866.0927599508.

The spelling of 649670616 in words is "six hundred forty-nine million, six hundred seventy thousand, six hundred sixteen".