775864385 has 4 divisors (see below), whose sum is σ = 931037268. Its totient is φ = 620691504.

The previous prime is 775864381. The next prime is 775864387. The reversal of 775864385 is 583468577.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 146506816 + 629357569 = 12104^2 + 25087^2 .

It is a cyclic number.

It is not a de Polignac number, because 775864385 - 2² = 775864381 is a prime.

It is a super-2 number, since 2×775864385² = 1203931087822856450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (775864381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77586434 + ... + 77586443.

It is an arithmetic number, because the mean of its divisors is an integer number (232759317).

Almost surely, 2^775864385 is an apocalyptic number.

It is an amenable number.

775864385 is a deficient number, since it is larger than the sum of its proper divisors (155172883).

775864385 is a wasteful number, since it uses less digits than its factorization.

775864385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155172882.

The product of its digits is 5644800, while the sum is 53.

The square root of 775864385 is about 27854.3423006180. The cubic root of 775864385 is about 918.8866435047.

The spelling of 775864385 in words is "seven hundred seventy-five million, eight hundred sixty-four thousand, three hundred eighty-five".