2821259780 has 96 divisors (see below), whose sum is σ = 6370237440. Its totient is φ = 1047191040.

The previous prime is 2821259773. The next prime is 2821259827. The reversal of 2821259780 is 879521282.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3110087 + ... + 3110993.

It is an arithmetic number, because the mean of its divisors is an integer number (66356640).

Almost surely, 2^2821259780 is an apocalyptic number.

2821259780 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 2821259780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3185118720).

2821259780 is an abundant number, since it is smaller than the sum of its proper divisors (3548977660).

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

2821259780 is a wasteful number, since it uses less digits than its factorization.

2821259780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1149 (or 1147 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 44.

The square root of 2821259780 is about 53115.5323798981. The cubic root of 2821259780 is about 1413.0179944741.

The spelling of 2821259780 in words is "two billion, eight hundred twenty-one million, two hundred fifty-nine thousand, seven hundred eighty".