649782630 has 240 divisors, whose sum is σ = 2055441024. Its totient is φ = 142248960.

The previous prime is 649782629. The next prime is 649782647. The reversal of 649782630 is 36287946.

649782630 is a `hidden beast` number, since 6 + 4 + 9 + 7 + 8 + 2 + 630 = 666.

649782630 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

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 119 ways as a sum of consecutive naturals, for example, 6698742 + ... + 6698838.

Almost surely, 2^649782630 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 649782630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1027720512).

649782630 is an abundant number, since it is smaller than the sum of its proper divisors (1405658394).

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

649782630 is a wasteful number, since it uses less digits than its factorization.

649782630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169 (or 145 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 45.

The square root of 649782630 is about 25490.8342350736. The cubic root of 649782630 is about 866.1425333472.

The spelling of 649782630 in words is "six hundred forty-nine million, seven hundred eighty-two thousand, six hundred thirty".