2782805808 has 80 divisors (see below), whose sum is σ = 7314817536. Its totient is φ = 911447040.

The previous prime is 2782805791. The next prime is 2782805813. The reversal of 2782805808 is 8085082872.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 1147285 + ... + 1149707.

Almost surely, 2^2782805808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2782805808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3657408768).

2782805808 is an abundant number, since it is smaller than the sum of its proper divisors (4532011728).

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

2782805808 is a wasteful number, since it uses less digits than its factorization.

2782805808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2842 (or 2836 counting only the distinct ones).

The product of its (nonzero) digits is 573440, while the sum is 48.

The square root of 2782805808 is about 52752.3061865545. The cubic root of 2782805808 is about 1406.5687585871.

The spelling of 2782805808 in words is "two billion, seven hundred eighty-two million, eight hundred five thousand, eight hundred eight".