981778768 has 20 divisors (see below), whose sum is σ = 1902958560. Its totient is φ = 490692704.

The previous prime is 981778729. The next prime is 981778793. The reversal of 981778768 is 867877189.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34221 + ... + 55987.

It is an arithmetic number, because the mean of its divisors is an integer number (95147928).

Almost surely, 2^981778768 is an apocalyptic number.

It is an amenable number.

981778768 is a deficient number, since it is larger than the sum of its proper divisors (921179792).

981778768 is a wasteful number, since it uses less digits than its factorization.

981778768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24594 (or 24588 counting only the distinct ones).

The product of its digits is 9483264, while the sum is 61.

The square root of 981778768 is about 31333.3491347478. The cubic root of 981778768 is about 993.8889875983. Note that the first 3 decimals are identical.

The spelling of 981778768 in words is "nine hundred eighty-one million, seven hundred seventy-eight thousand, seven hundred sixty-eight".