2781803388 has 96 divisors (see below), whose sum is σ = 8062405120. Its totient is φ = 726900480.

The previous prime is 2781803369. The next prime is 2781803399. The reversal of 2781803388 is 8833081872.

It is a congruent number.

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, 107343 + ... + 130713.

Almost surely, 2^2781803388 is an apocalyptic number.

2781803388 is a gapful number since it is divisible by the number (28) 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 2781803388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4031202560).

2781803388 is an abundant number, since it is smaller than the sum of its proper divisors (5280601732).

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

2781803388 is a wasteful number, since it uses less digits than its factorization.

2781803388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23507 (or 23505 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 48.

The square root of 2781803388 is about 52742.8041347822. The cubic root of 2781803388 is about 1406.3998472932.

The spelling of 2781803388 in words is "two billion, seven hundred eighty-one million, eight hundred three thousand, three hundred eighty-eight".