1616217780 has 96 divisors (see below), whose sum is σ = 4657580928. Its totient is φ = 418521600.

The previous prime is 1616217731. The next prime is 1616217791. The reversal of 1616217780 is 877126161.

It is a super-2 number, since 2×1616217780² = 5224319824776256800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 465250 + ... + 468710.

It is an arithmetic number, because the mean of its divisors is an integer number (48516468).

Almost surely, 2^1616217780 is an apocalyptic number.

1616217780 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 1616217780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2328790464).

1616217780 is an abundant number, since it is smaller than the sum of its proper divisors (3041363148).

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

1616217780 is a wasteful number, since it uses less digits than its factorization.

1616217780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3697 (or 3695 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 39.

The square root of 1616217780 is about 40202.2111332200. The cubic root of 1616217780 is about 1173.5455745177.

The spelling of 1616217780 in words is "one billion, six hundred sixteen million, two hundred seventeen thousand, seven hundred eighty".