649513830 has 128 divisors (see below), whose sum is σ = 1821782016. Its totient is φ = 145152000.

The previous prime is 649513819. The next prime is 649513847. The reversal of 649513830 is 38315946.

It is a super-2 number, since 2×649513830² = 843736430722537800, which contains 22 as substring.

It is a Curzon number.

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 63 ways as a sum of consecutive naturals, for example, 2396595 + ... + 2396865.

It is an arithmetic number, because the mean of its divisors is an integer number (14232672).

Almost surely, 2^649513830 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 649513830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (910891008).

649513830 is an abundant number, since it is smaller than the sum of its proper divisors (1172268186).

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

649513830 is a wasteful number, since it uses less digits than its factorization.

649513830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 502.

The product of its (nonzero) digits is 77760, while the sum is 39.

The square root of 649513830 is about 25485.5612062988. The cubic root of 649513830 is about 866.0230825167.

The spelling of 649513830 in words is "six hundred forty-nine million, five hundred thirteen thousand, eight hundred thirty".