1778616812 has 12 divisors (see below), whose sum is σ = 3557233680. Its totient is φ = 762264336.

The previous prime is 1778616799. The next prime is 1778616881. The reversal of 1778616812 is 2186168771.

1778616812 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31760987 + ... + 31761042.

It is an arithmetic number, because the mean of its divisors is an integer number (296436140).

Almost surely, 2^1778616812 is an apocalyptic number.

It is an amenable number.

1778616812 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1778616812 is a wasteful number, since it uses less digits than its factorization.

1778616812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63522040 (or 63522038 counting only the distinct ones).

The product of its digits is 225792, while the sum is 47.

The square root of 1778616812 is about 42173.6506838097. The cubic root of 1778616812 is about 1211.6042768765.

The spelling of 1778616812 in words is "one billion, seven hundred seventy-eight million, six hundred sixteen thousand, eight hundred twelve".