1368144778 has 96 divisors (see below), whose sum is σ = 2823387840. Its totient is φ = 488759040.

The previous prime is 1368144749. The next prime is 1368144779. The reversal of 1368144778 is 8774418631.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (1368144779) 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, 3265053 + ... + 3265471.

It is an arithmetic number, because the mean of its divisors is an integer number (29410290).

Almost surely, 2^1368144778 is an apocalyptic number.

1368144778 is an abundant number, since it is smaller than the sum of its proper divisors (1455243062).

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

1368144778 is a wasteful number, since it uses less digits than its factorization.

1368144778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 692 (or 685 counting only the distinct ones).

The product of its digits is 903168, while the sum is 49.

The square root of 1368144778 is about 36988.4411404428. The cubic root of 1368144778 is about 1110.1389805147.

The spelling of 1368144778 in words is "one billion, three hundred sixty-eight million, one hundred forty-four thousand, seven hundred seventy-eight".