2621916780 has 192 divisors, whose sum is σ = 8945664000. Its totient is φ = 560431872.

The previous prime is 2621916751. The next prime is 2621916821. The reversal of 2621916780 is 876191262.

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

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 628341 + ... + 632499.

It is an arithmetic number, because the mean of its divisors is an integer number (46592000).

Almost surely, 2^2621916780 is an apocalyptic number.

2621916780 is a gapful number since it is divisible by the number (20) 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 2621916780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4472832000).

2621916780 is an abundant number, since it is smaller than the sum of its proper divisors (6323747220).

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

2621916780 is a wasteful number, since it uses less digits than its factorization.

2621916780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4276 (or 4274 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 2621916780 is about 51204.6558429993. The cubic root of 2621916780 is about 1378.9217896008.

The spelling of 2621916780 in words is "two billion, six hundred twenty-one million, nine hundred sixteen thousand, seven hundred eighty".