775803649 has 4 divisors (see below), whose sum is σ = 816635440. Its totient is φ = 734971860.

The previous prime is 775803643. The next prime is 775803661. The reversal of 775803649 is 946308577.

It is a happy number.

775803649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 946308577 = 41 ⋅23080697.

It is a cyclic number.

It is not a de Polignac number, because 775803649 - 2³ = 775803641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (775803641) 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, 20415867 + ... + 20415904.

It is an arithmetic number, because the mean of its divisors is an integer number (204158860).

Almost surely, 2^775803649 is an apocalyptic number.

It is an amenable number.

775803649 is a deficient number, since it is larger than the sum of its proper divisors (40831791).

775803649 is a wasteful number, since it uses less digits than its factorization.

775803649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40831790.

The product of its (nonzero) digits is 1270080, while the sum is 49.

The square root of 775803649 is about 27853.2520363422. The cubic root of 775803649 is about 918.8626655361.

The spelling of 775803649 in words is "seven hundred seventy-five million, eight hundred three thousand, six hundred forty-nine".