3850781678978 has 24 divisors (see below), whose sum is σ = 6427627541244. Its totient is φ = 1719952103520.

The previous prime is 3850781678963. The next prime is 3850781678983. The reversal of 3850781678978 is 8798761870583.

It can be written as a sum of positive squares in 2 ways, for example, as 2714035489489 + 1136746189489 = 1647433^2 + 1066183^2 .

It is a junction number, because it is equal to n+sod(n) for n = 3850781678899 and 3850781678908.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 77033801 + ... + 77083772.

Almost surely, 2^{3850781678978} is an apocalyptic number.

3850781678978 is a deficient number, since it is larger than the sum of its proper divisors (2576845862266).

3850781678978 is a wasteful number, since it uses less digits than its factorization.

3850781678978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154117650 (or 154117619 counting only the distinct ones).

The product of its (nonzero) digits is 1137991680, while the sum is 77.

The spelling of 3850781678978 in words is "three trillion, eight hundred fifty billion, seven hundred eighty-one million, six hundred seventy-eight thousand, nine hundred seventy-eight".