775864847 has 2 divisors, whose sum is σ = 775864848. Its totient is φ = 775864846.

The previous prime is 775864787. The next prime is 775864897. The reversal of 775864847 is 748468577.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 775864847 - 2⁸ = 775864591 is a prime.

It is a super-3 number, since 3×775864847³ (a number of 28 digits) contains 333 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 775864792 and 775864801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (775864897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 387932423 + 387932424.

It is an arithmetic number, because the mean of its divisors is an integer number (387932424).

Almost surely, 2^775864847 is an apocalyptic number.

775864847 is a deficient number, since it is larger than the sum of its proper divisors (1).

775864847 is an equidigital number, since it uses as much as digits as its factorization.

775864847 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10536960, while the sum is 56.

The square root of 775864847 is about 27854.3505937582. The cubic root of 775864847 is about 918.8868258929.

The spelling of 775864847 in words is "seven hundred seventy-five million, eight hundred sixty-four thousand, eight hundred forty-seven".