1649373660 has 288 divisors, whose sum is σ = 6085497600. Its totient is φ = 356382720.

The previous prime is 1649373659. The next prime is 1649373667. The reversal of 1649373660 is 663739461.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1649373667) by changing a digit.

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 95 ways as a sum of consecutive naturals, for example, 638251 + ... + 640829.

It is an arithmetic number, because the mean of its divisors is an integer number (21130200).

Almost surely, 2^1649373660 is an apocalyptic number.

1649373660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1649373660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3042748800).

1649373660 is an abundant number, since it is smaller than the sum of its proper divisors (4436123940).

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

1649373660 is a wasteful number, since it uses less digits than its factorization.

1649373660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2641 (or 2636 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 45.

The square root of 1649373660 is about 40612.4815789432. The cubic root of 1649373660 is about 1181.5162114379.

The spelling of 1649373660 in words is "one billion, six hundred forty-nine million, three hundred seventy-three thousand, six hundred sixty".