1968378646 has 32 divisors (see below), whose sum is σ = 3229178400. Its totient is φ = 894432000.

The previous prime is 1968378637. The next prime is 1968378649. The reversal of 1968378646 is 6468738691.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1968378649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 579120 + ... + 582508.

It is an arithmetic number, because the mean of its divisors is an integer number (100911825).

Almost surely, 2^1968378646 is an apocalyptic number.

1968378646 is a deficient number, since it is larger than the sum of its proper divisors (1260799754).

1968378646 is a wasteful number, since it uses less digits than its factorization.

1968378646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3744.

The product of its digits is 10450944, while the sum is 58.

The square root of 1968378646 is about 44366.4134903871. The cubic root of 1968378646 is about 1253.2456763207.

The spelling of 1968378646 in words is "one billion, nine hundred sixty-eight million, three hundred seventy-eight thousand, six hundred forty-six".