2783655378 has 96 divisors (see below), whose sum is σ = 7316749440. Its totient is φ = 746657280.

The previous prime is 2783655377. The next prime is 2783655389. The reversal of 2783655378 is 8735563872.

2783655378 is a `hidden beast` number, since 2 + 7 + 83 + 6 + 553 + 7 + 8 = 666.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (2783655377) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 986053 + ... + 988871.

It is an arithmetic number, because the mean of its divisors is an integer number (76216140).

Almost surely, 2^2783655378 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2783655378, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3658374720).

2783655378 is an abundant number, since it is smaller than the sum of its proper divisors (4533094062).

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

2783655378 is a wasteful number, since it uses less digits than its factorization.

2783655378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3312 (or 3309 counting only the distinct ones).

The product of its digits is 8467200, while the sum is 54.

The square root of 2783655378 is about 52760.3580162227. The cubic root of 2783655378 is about 1406.7118823642.

The spelling of 2783655378 in words is "two billion, seven hundred eighty-three million, six hundred fifty-five thousand, three hundred seventy-eight".