649640992 has 192 divisors, whose sum is σ = 1819770624. Its totient is φ = 219709440.

The previous prime is 649640987. The next prime is 649641011. The reversal of 649640992 is 299046946.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 543948 + ... + 545140.

It is an arithmetic number, because the mean of its divisors is an integer number (9477972).

Almost surely, 2^649640992 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 649640992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (909885312).

649640992 is an abundant number, since it is smaller than the sum of its proper divisors (1170129632).

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

649640992 is a wasteful number, since it uses less digits than its factorization.

649640992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1251 (or 1243 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 49.

The square root of 649640992 is about 25488.0558693675. The cubic root of 649640992 is about 866.0795955763.

The spelling of 649640992 in words is "six hundred forty-nine million, six hundred forty thousand, nine hundred ninety-two".