2785405656 has 64 divisors (see below), whose sum is σ = 7656468480. Its totient is φ = 837406080.

The previous prime is 2785405633. The next prime is 2785405657. The reversal of 2785405656 is 6565045872.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2785405657) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8011 + ... + 75066.

It is an arithmetic number, because the mean of its divisors is an integer number (119632320).

Almost surely, 2^2785405656 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 2785405656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3828234240).

2785405656 is an abundant number, since it is smaller than the sum of its proper divisors (4871062824).

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

2785405656 is a wasteful number, since it uses less digits than its factorization.

2785405656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83224 (or 83220 counting only the distinct ones).

The product of its (nonzero) digits is 2016000, while the sum is 48.

The square root of 2785405656 is about 52776.9424654366. The cubic root of 2785405656 is about 1407.0066531682.

The spelling of 2785405656 in words is "two billion, seven hundred eighty-five million, four hundred five thousand, six hundred fifty-six".