2781058820 has 48 divisors (see below), whose sum is σ = 6095219760. Its totient is φ = 1064534016.

The previous prime is 2781058817. The next prime is 2781058837. The reversal of 2781058820 is 288501872.

It can be written as a sum of positive squares in 8 ways, for example, as 325658116 + 2455400704 = 18046^2 + 49552^2 .

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44324 + ... + 86756.

It is an arithmetic number, because the mean of its divisors is an integer number (126983745).

Almost surely, 2^2781058820 is an apocalyptic number.

2781058820 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 2781058820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3047609880).

2781058820 is an abundant number, since it is smaller than the sum of its proper divisors (3314160940).

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

2781058820 is a wasteful number, since it uses less digits than its factorization.

2781058820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42584 (or 42582 counting only the distinct ones).

The product of its (nonzero) digits is 71680, while the sum is 41.

The square root of 2781058820 is about 52735.7451829402. The cubic root of 2781058820 is about 1406.2743587023.

The spelling of 2781058820 in words is "two billion, seven hundred eighty-one million, fifty-eight thousand, eight hundred twenty".