1649801328 has 160 divisors (see below), whose sum is σ = 4973253120. Its totient is φ = 461583360.

The previous prime is 1649801327. The next prime is 1649801333. The reversal of 1649801328 is 8231089461.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 1649801328.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1649801327) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3918558 + ... + 3918978.

It is an arithmetic number, because the mean of its divisors is an integer number (31082832).

Almost surely, 2^1649801328 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 1649801328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2486626560).

1649801328 is an abundant number, since it is smaller than the sum of its proper divisors (3323451792).

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

1649801328 is a wasteful number, since it uses less digits than its factorization.

1649801328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655 (or 649 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 1649801328 is about 40617.7464662923. The cubic root of 1649801328 is about 1181.6183215138.

The spelling of 1649801328 in words is "one billion, six hundred forty-nine million, eight hundred one thousand, three hundred twenty-eight".