1778796864 has 336 divisors, whose sum is σ = 5798840320. Its totient is φ = 517570560.

The previous prime is 1778796863. The next prime is 1778796871. The reversal of 1778796864 is 4686978771.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1778796863) 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, 18338064 + ... + 18338160.

Almost surely, 2^1778796864 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 1778796864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2899420160).

1778796864 is an abundant number, since it is smaller than the sum of its proper divisors (4020043456).

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

1778796864 is a wasteful number, since it uses less digits than its factorization.

1778796864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238 (or 225 counting only the distinct ones).

The product of its digits is 28449792, while the sum is 63.

The square root of 1778796864 is about 42175.7852801818. The cubic root of 1778796864 is about 1211.6451596589.

The spelling of 1778796864 in words is "one billion, seven hundred seventy-eight million, seven hundred ninety-six thousand, eight hundred sixty-four".