778646970 has 96 divisors (see below), whose sum is σ = 2056152384. Its totient is φ = 204422400.

The previous prime is 778646959. The next prime is 778646983. The reversal of 778646970 is 79646877.

It is a super-2 number, since 2×778646970² = 1212582207780361800, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2487534 + ... + 2487846.

It is an arithmetic number, because the mean of its divisors is an integer number (21418254).

Almost surely, 2^778646970 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 778646970, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1028076192).

778646970 is an abundant number, since it is smaller than the sum of its proper divisors (1277505414).

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

778646970 is a wasteful number, since it uses less digits than its factorization.

778646970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 668 (or 665 counting only the distinct ones).

The product of its (nonzero) digits is 3556224, while the sum is 54.

The square root of 778646970 is about 27904.2464510332. The cubic root of 778646970 is about 919.9838410835.

It can be divided in two parts, 7786 and 46970, that added together give a square (54756 = 234²).

The spelling of 778646970 in words is "seven hundred seventy-eight million, six hundred forty-six thousand, nine hundred seventy".