778980930 has 96 divisors (see below), whose sum is σ = 2342136384. Its totient is φ = 164352384.

The previous prime is 778980929. The next prime is 778980947. The reversal of 778980930 is 39089877.

It is a happy number.

778980930 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×778980930² = 1213622578607329800, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1272 + ... + 39491.

It is an arithmetic number, because the mean of its divisors is an integer number (24397254).

Almost surely, 2^778980930 is an apocalyptic number.

778980930 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 778980930, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1171068192).

778980930 is an abundant number, since it is smaller than the sum of its proper divisors (1563155454).

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

778980930 is a wasteful number, since it uses less digits than its factorization.

778980930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40800 (or 40793 counting only the distinct ones).

The product of its (nonzero) digits is 762048, while the sum is 51.

The square root of 778980930 is about 27910.2298449869. The cubic root of 778980930 is about 920.1153486436.

The spelling of 778980930 in words is "seven hundred seventy-eight million, nine hundred eighty thousand, nine hundred thirty".