1721868880 has 20 divisors (see below), whose sum is σ = 4003345332. Its totient is φ = 688747520.

The previous prime is 1721868877. The next prime is 1721868887. The reversal of 1721868880 is 888681271.

1721868880 is nontrivially palindromic in base 3 and base 9.

It can be written as a sum of positive squares in 2 ways, for example, as 172344384 + 1549524496 = 13128^2 + 39364^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a zygodrome in base 3 and base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1721868887) 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, 10761601 + ... + 10761760.

Almost surely, 2^1721868880 is an apocalyptic number.

1721868880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1721868880 is an abundant number, since it is smaller than the sum of its proper divisors (2281476452).

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

1721868880 is a wasteful number, since it uses less digits than its factorization.

1721868880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21523374 (or 21523368 counting only the distinct ones).

The product of its (nonzero) digits is 344064, while the sum is 49.

The square root of 1721868880 is about 41495.4079387105. The cubic root of 1721868880 is about 1198.5790774058.

The spelling of 1721868880 in words is "one billion, seven hundred twenty-one million, eight hundred sixty-eight thousand, eight hundred eighty".