775669 has 2 divisors, whose sum is σ = 775670. Its totient is φ = 775668.

The previous prime is 775661. The next prime is 775681. The reversal of 775669 is 966577.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 756900 + 18769 = 870^2 + 137^2 .

It is a cyclic number.

It is not a de Polignac number, because 775669 - 2³ = 775661 is a prime.

It is a super-2 number, since 2×775669² = 1203324795122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (775661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 387834 + 387835.

It is an arithmetic number, because the mean of its divisors is an integer number (387835).

2⁷⁷⁵⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

775669 is a deficient number, since it is larger than the sum of its proper divisors (1).

775669 is an equidigital number, since it uses as much as digits as its factorization.

775669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 79380, while the sum is 40.

The square root of 775669 is about 880.7207275862. The cubic root of 775669 is about 91.8809502987.

It can be divided in two parts, 775 and 669, that added together give a square (1444 = 38²).

The spelling of 775669 in words is "seven hundred seventy-five thousand, six hundred sixty-nine".