1946768778 has 24 divisors (see below), whose sum is σ = 4218832800. Its totient is φ = 648794664.

The previous prime is 1946768773. The next prime is 1946768833. The reversal of 1946768778 is 8778676491.

It is a super-2 number, since 2×1946768778² = 7579817349991226568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1946768773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 141363 + ... + 154521.

It is an arithmetic number, because the mean of its divisors is an integer number (175784700).

Almost surely, 2^1946768778 is an apocalyptic number.

1946768778 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1946768778 is an abundant number, since it is smaller than the sum of its proper divisors (2272064022).

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

1946768778 is a wasteful number, since it uses less digits than its factorization.

1946768778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21386 (or 21383 counting only the distinct ones).

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

The square root of 1946768778 is about 44122.2027781932. The cubic root of 1946768778 is about 1248.6425323322.

The spelling of 1946768778 in words is "one billion, nine hundred forty-six million, seven hundred sixty-eight thousand, seven hundred seventy-eight".