778912398 has 24 divisors (see below), whose sum is σ = 1841066136. Its totient is φ = 236034000.

The previous prime is 778912397. The next prime is 778912403. The reversal of 778912398 is 893219877.

778912398 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 2×778912398² = 1213409047516220808, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778912397) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1966753 + ... + 1967148.

It is an arithmetic number, because the mean of its divisors is an integer number (76711089).

Almost surely, 2^778912398 is an apocalyptic number.

778912398 is an abundant number, since it is smaller than the sum of its proper divisors (1062153738).

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

778912398 is a wasteful number, since it uses less digits than its factorization.

778912398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3933920 (or 3933917 counting only the distinct ones).

The product of its digits is 1524096, while the sum is 54.

The square root of 778912398 is about 27909.0020960980. The cubic root of 778912398 is about 920.0883650158.

The spelling of 778912398 in words is "seven hundred seventy-eight million, nine hundred twelve thousand, three hundred ninety-eight".