1648821280 has 24 divisors (see below), whose sum is σ = 3895340652. Its totient is φ = 659528448.

The previous prime is 1648821271. The next prime is 1648821281. The reversal of 1648821280 is 821288461.

It can be written as a sum of positive squares in 2 ways, for example, as 1521312016 + 127509264 = 39004^2 + 11292^2 .

It is a super-2 number, since 2×1648821280² = 5437223226761676800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (1648821281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5152407 + ... + 5152726.

Almost surely, 2^1648821280 is an apocalyptic number.

1648821280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1648821280 is an abundant number, since it is smaller than the sum of its proper divisors (2246519372).

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

1648821280 is a wasteful number, since it uses less digits than its factorization.

1648821280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10305148 (or 10305140 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 40.

The square root of 1648821280 is about 40605.6803908025. The cubic root of 1648821280 is about 1181.3842989809.

The spelling of 1648821280 in words is "one billion, six hundred forty-eight million, eight hundred twenty-one thousand, two hundred eighty".