649289550 has 144 divisors (see below), whose sum is σ = 1993265280. Its totient is φ = 136955520.

The previous prime is 649289539. The next prime is 649289567. The reversal of 649289550 is 55982946.

It is a self number, because there is not a number n which added to its sum of digits gives 649289550.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 175621 + ... + 179279.

It is an arithmetic number, because the mean of its divisors is an integer number (13842120).

Almost surely, 2^649289550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 649289550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (996632640).

649289550 is an abundant number, since it is smaller than the sum of its proper divisors (1343975730).

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

649289550 is a wasteful number, since it uses less digits than its factorization.

649289550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3707 (or 3689 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 48.

The square root of 649289550 is about 25481.1606878494. The cubic root of 649289550 is about 865.9233905068.

The spelling of 649289550 in words is "six hundred forty-nine million, two hundred eighty-nine thousand, five hundred fifty".