705778823 has 4 divisors (see below), whose sum is σ = 722192328. Its totient is φ = 689365320.

The previous prime is 705778789. The next prime is 705778831. The reversal of 705778823 is 328877507.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 328877507 = 7 ⋅46982501.

It is a cyclic number.

It is not a de Polignac number, because 705778823 - 2¹⁶ = 705713287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (705778873) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8206688 + ... + 8206773.

It is an arithmetic number, because the mean of its divisors is an integer number (180548082).

Almost surely, 2^705778823 is an apocalyptic number.

705778823 is a deficient number, since it is larger than the sum of its proper divisors (16413505).

705778823 is a wasteful number, since it uses less digits than its factorization.

705778823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16413504.

The product of its (nonzero) digits is 658560, while the sum is 47.

The square root of 705778823 is about 26566.4981320459. The cubic root of 705778823 is about 890.3406611568.

The spelling of 705778823 in words is "seven hundred five million, seven hundred seventy-eight thousand, eight hundred twenty-three".