778678243 has 8 divisors (see below), whose sum is σ = 918625280. Its totient is φ = 645908040.

The previous prime is 778678223. The next prime is 778678247. The reversal of 778678243 is 342876877.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 778678243 - 2²⁵ = 745123811 is a prime.

It is a super-2 number, since 2×778678243² = 1212679612243134098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (778678247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1793973 + ... + 1794406.

It is an arithmetic number, because the mean of its divisors is an integer number (114828160).

Almost surely, 2^778678243 is an apocalyptic number.

778678243 is a deficient number, since it is larger than the sum of its proper divisors (139947037).

778678243 is a wasteful number, since it uses less digits than its factorization.

778678243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3588417.

The product of its digits is 3161088, while the sum is 52.

The square root of 778678243 is about 27904.8068081469. The cubic root of 778678243 is about 919.9961574351.

The spelling of 778678243 in words is "seven hundred seventy-eight million, six hundred seventy-eight thousand, two hundred forty-three".